# Math Help - Congruent Polygon

1. ## Congruent Polygon

Polygon ABCD is congruent to polygon A'B'C'D'. If angle A corresponds to angle A',the value of angle A' is 5x - 65 and the value of angle A is 2x - 5,
find angle A.

2. Originally Posted by symmetry
Polygon ABCD is congruent to polygon A'B'C'D'. If angle A corresponds to angle A',the value of angle A' is 5x - 65 and the value of angle A is 2x - 5,
find angle A.
Because they correspond, you know that angle A is equal to angle A'

Therefore: $2x-5=5x-65\quad\rightarrow\quad 3x=60\quad\rightarrow\quad x=20$

3. ## ok

You are great!

Thanks!