Answer:
x = 103 and x + 25 = 128°
Explanation:
the sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
here n = 5 , then
sum = 180° × (5 - 2) = 180° × 3 = 540°
(a)
sum the interior angles and equate to 540
x + x + x + x + x + 25 = 540
5x + 25 = 540 ( subtract 25 from both sides )
5x = 515 ( divide both sides by 5 )
x = 103
(b)
largest angle = x + 25 = 103 + 25 = 128°