# 8.4.2. Isosceles Triangles

Given that

- A
- B
- C
- D

### Example

Given that

### Solution

Step 1: Find

If two sides of a triangle are congruent, then the two angles
opposite to those sides are also congruent. In

Write an equation to show that the sum of angles for

Therefore,

Step 2: Find

Opposite angles of a parallelogram are equal in measure.
Therefore,

Step 3: Find

If two sides of a triangle are congruent, then the two angles
opposite to those sides are congruent. In

To find

Step 4: Find

Subtract