Question

In isosceles triangle RST below, what is the value of y?

Triangle R S T. Angle T is 38 degrees and angles R and S are y.

Answer 1

71°

Explanation:

total angle in a triangle is 180

y + y + 38 = 180

2y = 142

y = 71°

Answer 2

y =71

Explanation:

The sum of the angles of a triangle add to 180

y+y+38 = 180

Combine like terms

2y +38 =180

Subtract 38 from each side

2y+38-38 =180-38

2y = 142

Divide each side by 2

2y/2 =142/2

y = 71