Question

What is the measurement of angle A? ​

Answer 1

Answer:

51

Step-by-step explanation:

All triangles =180 degrees

180-78 = 102

Since this triangle is an isosceles triangle, that means that 2 sides are the same length, and that 2 angles are the same.

102/2 (you divide by 2 bc the angles unknown are the same measurement) and that equals 51 degrees