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 = (270)/(9) = 30`