Activity
10.3 Triangle Plus Two
The picture shows 3 triangles. Triangle 2 and Triangle 3 are images of
Triangle 1 under rigid transformations.
E
B
A
11
C
D
1. Describe a rigid transformation that takes Triangle 1 to Triangle 2. What
points in Triangle 2 correspond to points A, B, and C in the original triangle?
2. Describe a rigid transformation that takes Triangle 1 to Triangle 3. What
points in Triangle 3 correspond to points A, B, and C in the original triangle?
3. Find two pairs of line segments in the diagram that are the same length,
and explain how you know they are the same length.
4. Find two pairs of angles in the diagram that have the same measure, and
in how you know they have the same measure.