An angle is in standard position if its vertex is located at the origin and its initial side extends along the positive x-axis.
-
-
-
-TBIL.plot_angle(5*pi/4)
-
-
-
- An angle measured counterclockwise from the initial side has a positive measure, while an angle measured clockwise from the initial side has a negative measure.
-
-
-
-
-TBIL.plot_angle(-3*pi/4)
-
-
+
+
+
+
+
+
+ An angle measured counterclockwise from the initial side has a positive measure, while an angle measured clockwise from the initial side has a negative measure.
+
Draw an angle of measure -225^{\circ} in standard position.
-
-
-
-TBIL.plot_angle(-225*pi/180)
-
-
+
+
+
+
+
@@ -223,13 +214,11 @@ TBIL.plot_angle(-225*pi/180)
A central angle is an angle whose vertex is at the center of a circle.
-
-
-
-p=TBIL.plot_angle(2*pi/3,show_unit_circle=True,show_angle_value=False,degree_labels=False)
-p
-
-
+
+
+
+
+
@@ -241,17 +230,12 @@ p
One radian is the measure of a central angle of a circle that intersects an arc the same length as the radius.
+
+
+
+
+
-
-
-
-p=TBIL.plot_angle(1,show_unit_circle=True,show_angle_value=True,degree_labels=False)
-p+=arc((0,0),1,sector=(0,1),color="blue",thickness=2)
-p+=text("$r$",(0.5,0.07),fontsize=20)
-p+=text("$r$",(0.87,0.6),fontsize=20)
-p
-
-
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle1.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle1.xml
new file mode 100644
index 000000000..90db6c407
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle1.xml
@@ -0,0 +1,14 @@
+
+ width=1
+ p1=1/sqrt(2)*(1,1)
+ p2=1/sqrt(2)*(-1,1)
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle2.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle2.xml
new file mode 100644
index 000000000..93f59c032
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle2.xml
@@ -0,0 +1,14 @@
+
+ width=1
+ p1=(cos(-pi/6),sin(-pi/6))
+ p2=(cos(5*pi/6),sin(5*pi/6))
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle3.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle3.xml
new file mode 100644
index 000000000..e05987407
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle3.xml
@@ -0,0 +1,16 @@
+
+ width=1
+ t1=pi/2
+ t2=5*pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle4.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle4.xml
new file mode 100644
index 000000000..0dc2a4746
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle4.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=5*pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle5.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle5.xml
new file mode 100644
index 000000000..1639d9d00
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle5.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=5*pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle6.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle6.xml
new file mode 100644
index 000000000..ce05d3b33
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle6.xml
@@ -0,0 +1,19 @@
+
+ width=1.2
+ t1=0
+ t2=pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle7.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle7.xml
new file mode 100644
index 000000000..98afb0c15
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle7.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=pi
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle8.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle8.xml
new file mode 100644
index 000000000..201a7f395
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle8.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=7*pi/6
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-angle9.xml b/source/precalculus/source/06-TR/prefigure/TR1-angle9.xml
new file mode 100644
index 000000000..44a0ac6b5
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-angle9.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=3*pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-central-angle.xml b/source/precalculus/source/06-TR/prefigure/TR1-central-angle.xml
new file mode 100644
index 000000000..cf4ab16f7
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-central-angle.xml
@@ -0,0 +1,22 @@
+
+ width=1.2
+ t1=0
+ t2=2*pi/3
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR1-radian.xml b/source/precalculus/source/06-TR/prefigure/TR1-radian.xml
new file mode 100644
index 000000000..aa381c4cd
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR1-radian.xml
@@ -0,0 +1,33 @@
+
+ width=1.2
+ t1=0
+ t2=pi/3
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+ 1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
From 7e3d2fd730855d6c1169bd6643928eea9dc5175e Mon Sep 17 00:00:00 2001
From: Drew Lewis
Date: Fri, 23 Jan 2026 23:31:37 +0000
Subject: [PATCH 3/6] TR2 images
---
source/precalculus/source/06-TR/02.ptx | 66 +++++++------------
.../source/06-TR/prefigure/TR2-angle1.xml | 20 ++++++
.../source/06-TR/prefigure/TR2-angle2.xml | 20 ++++++
.../06-TR/prefigure/TR2-arc-length1.xml | 30 +++++++++
.../06-TR/prefigure/TR2-arc-length2.xml | 30 +++++++++
5 files changed, 124 insertions(+), 42 deletions(-)
create mode 100644 source/precalculus/source/06-TR/prefigure/TR2-angle1.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR2-angle2.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR2-arc-length1.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR2-arc-length2.xml
diff --git a/source/precalculus/source/06-TR/02.ptx b/source/precalculus/source/06-TR/02.ptx
index f5bb59c27..75d9b7cd1 100644
--- a/source/precalculus/source/06-TR/02.ptx
+++ b/source/precalculus/source/06-TR/02.ptx
@@ -15,11 +15,10 @@
Consider the portion of a circle of radius 3 graphed below.
-
-
-
-p=TBIL.plot_angle(pi/3,show_axes=True,show_angle_value=True,degree_labels=True,show_unit_circle=True)
-p+=arc((0,0),1,sector=(0,pi/3),color="blue",thickness=3)
-p+=text("$3$", (0.5,0.05),color="black")
-p
-
+
+
+
+
diff --git a/source/precalculus/source/06-TR/prefigure/TR2-angle1.xml b/source/precalculus/source/06-TR/prefigure/TR2-angle1.xml
new file mode 100644
index 000000000..738caaf49
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR2-angle1.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=pi/4
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR2-angle2.xml b/source/precalculus/source/06-TR/prefigure/TR2-angle2.xml
new file mode 100644
index 000000000..3383bdffc
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR2-angle2.xml
@@ -0,0 +1,20 @@
+
+ width=1.2
+ t1=0
+ t2=pi/3
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+ 60^\circ
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR2-arc-length1.xml b/source/precalculus/source/06-TR/prefigure/TR2-arc-length1.xml
new file mode 100644
index 000000000..8fe77b28e
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR2-arc-length1.xml
@@ -0,0 +1,30 @@
+
+ width=1.2
+ t1=0
+ t2=pi/2
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+ 90^\circ
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/source/precalculus/source/06-TR/prefigure/TR2-arc-length2.xml b/source/precalculus/source/06-TR/prefigure/TR2-arc-length2.xml
new file mode 100644
index 000000000..63431f683
--- /dev/null
+++ b/source/precalculus/source/06-TR/prefigure/TR2-arc-length2.xml
@@ -0,0 +1,30 @@
+
+ width=1.2
+ t1=0
+ t2=pi/3
+ p1=(cos(t1),sin(t1))
+ p2=(cos(t2),sin(t2))
+
+
+
+
+ 60^\circ
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
From 9de77ea513037c9ff9926f9f6001d7c903c7d860 Mon Sep 17 00:00:00 2001
From: Drew Lewis
Date: Sat, 24 Jan 2026 00:24:34 +0000
Subject: [PATCH 4/6] TR5 graphs
---
source/precalculus/source/06-TR/05.ptx | 104 +++++++-----------
.../source/06-TR/prefigure/TR5-angle1.xml | 24 ++++
.../source/06-TR/prefigure/TR5-angle2.xml | 30 +++++
.../06-TR/prefigure/TR5-point-unit-circle.xml | 32 ++++++
.../source/06-TR/prefigure/TR5-triangle.xml | 47 ++++++++
.../source/06-TR/prefigure/TR5-triangle2.xml | 41 +++++++
.../source/06-TR/prefigure/TR5-triangle3.xml | 41 +++++++
.../06-TR/prefigure/TR5-unit-circle.xml | 16 +++
8 files changed, 269 insertions(+), 66 deletions(-)
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-angle1.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-angle2.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-point-unit-circle.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-triangle.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-triangle2.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-triangle3.xml
create mode 100644 source/precalculus/source/06-TR/prefigure/TR5-unit-circle.xml
diff --git a/source/precalculus/source/06-TR/05.ptx b/source/precalculus/source/06-TR/05.ptx
index b627ccf84..613c4664b 100644
--- a/source/precalculus/source/06-TR/05.ptx
+++ b/source/precalculus/source/06-TR/05.ptx
@@ -24,12 +24,12 @@
The unit circle is the circle of radius 1 centered at the origin on the coordinate plane.
-
- Unit circle
-
- p=circle((0,0),1,color="blue")
-
-
+
+
+
+
+ A circle of radius 1 centered at the origin
+
@@ -42,18 +42,11 @@
Let \theta be the angle shown below in standard form. Notice that the terminal side intersects with the unit circle. (Note: We will assume a circle drawn in this context is the unit circle unless told otherwise.) We will label that point of intersection as (x,y).
Let's consider the angle \theta=150^\circ, drawn below with the unit circle.
-
-
-
-
-p=TBIL.plot_angle(5*pi/6,show_unit_circle=True,show_angle_value=True,degree_labels=True)
-p
-
-
-
+
+
+
+
+
@@ -366,14 +346,11 @@ p
What is the measure of \alpha?
-
-
-
-p=TBIL.plot_angle(5*pi/6,reference_angle=pi/6,show_unit_circle=True,show_angle_value=True,degree_labels=True)
-p+=TBIL.plot_angle(pi/6,show_unit_circle=True,show_angle_value=r"$\alpha$")
-p
-
-
+
+
+
+
+
@@ -398,23 +375,18 @@ p
angle \alpha=30^\circ to help. Find the point (x_1,y_1), where the terminal side of the
30^\circ angle intersects the unit circle.
-
-
-
-
-p=TBIL.plot_angle(5*pi/6,show_unit_circle=True,show_angle_value=True,degree_labels=True,show_unit_point=True,label_unit_point=("x","y"),show_triangle=True)
-p
-
-
-
-
-
-
-p=TBIL.plot_angle(pi/6,show_unit_circle=True,show_angle_value=True,degree_labels=True,show_unit_point=True,label_unit_point=("x_1","y_1"),show_triangle=True)
-p
-
-
-
+
+
+
+
+
+
+
+
+
+
+
+
The angle below represents the reference angle for \theta=\dfrac{4\pi}{3}, which is the smallest angle between the terminal side of \theta and the x-axis. What is the measure of this reference angle?
We can find the sine and cosines values of our original angle, \theta=\dfrac{4\pi}{3}, by using the reference angle to help. Find the point (x_1,y_1), where the terminal side of the angle \dfrac{\pi}{3} intersects the unit circle.