standard_description: Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.
problem_activity: Problem 1
Show students Graph 21 from
Which One Doesn't Belong: Graphs and Equations
.
Problem 2
Do this Desmos activity,
Sine Transformations
, with students.
Problem 3
Write both a sine and cosine function that model the graph shown below.
[IMG]


aligns: no