Look at Part 1. What is the sum of the angle measures in triangle ABC? How do you know?
180° because triangles have a sum of 180°.
One of the angles in triangle ABC is equal to 90°. What is the sum of the other two angles?
What expression can you use to find the measure of
What is the measure of
What type of triangle is triangle ABC? How do you know?
Isosceles right triangle because two of the angle measures are equal (45°), which means it is isosceles. Also, one angle is equal to 90°, which means that it is a right triangle.
What do you notice about the angle measures in both triangle ABC and triangle A'B'C'?
They are the same.
Look at Part 2. Triangle EFG is an equilateral triangle. What is the length of
4 units because an equilateral triangle has equal sides. The side lengths do not change after a rotation.
Look at Part 3. What is the length of
2 units because opposite sides of a rectangle are equivalent. After a reflection, the side lengths remain the same.
What can you conclude about the measures of
They are equal because corresponding angles of a pre-image and an image are equivalent.
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