Question

What is the value of s?

Answer 1

s = 63°

Explanation:

the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.

s + 50 is an exterior angle of the triangle , then

s + 50 = s - 13 + s

s + 50 = 2s - 13 ( subtract s from both sides )

50 = s - 13 ( add 13 to both sides )

63 = s

Answer 2

63

Explanation:

(s-13) +s = s + 50

2s - 13 = s + 50

add 13 both sides, subtract the s from both sides

s = 63