Find the length of and .
We know that is congruent to
because two sides and the included angle in one triangle are congruent to the corresponding parts of the other triangle.
Step 1: Find the length of .
Since , and are congruent. They have the same length: .
Step 2: Find the length of .
To find the length of , subtract the length of from the length of .
Note that since , and are congruent. They have the same length: .