Question

What is the value of x?

a. 71°
b. 142°
c. 152°
d. 76°

Answer 1

The sum of the measures of the angles of a triangle is 180 degrees.
An isosceles triangle has two congruent sides.
The angles opposite the congruent sides are congruent.
Just like the bottom left angle measures x, the bottom right angle also measures x.

x + x + 38 = 180

2x + 38 = 180

2x = 142

x = 71

Answer 2

If both side are the same then the angles are the same. Now knowing that the sym of a triangle is 180 degrees then we can now subtract 38 to get 142 and then divide 142 by 2 which is 71 so that means each of the other two angles is 71 degrees and your answer is A.
Hope this helpsssss