Question

Find the value of x.

Answer 1

Angles sum up to:

( n - 2 ) × 180 = ( 5 - 2 ) × 180 = 3 × 180 = 540

$x + 4x + 4x + 135 + 135 = 540$

$9x + 270 = 540$

$9x = 540 - 270 \\ 9x = 270$

$x = \frac{270}{9} = 30$