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: [IMG]
$${y=-3\mathrm{sin}(2x)+3}$$
On the graph, label the amplitude, period, midline, and phase shift, and explain how each feature connects to the equation.
Write a different equation that produces the same graph.


aligns: no