Question

Someone help !!
geometry: find the value of x

Answer 1

x = 18

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° × 3 = 540°

sum the 5 interior angles and equate to 540

3x + 23 + 95 + 7x - 4 + 90 + 9x - 6 = 540

19x + 198 = 540 ( subtract 198 from both sides )

19x = 342 ( divide both sides by 19 )

x = 18