Question

I need help to find out this question

Answer 1

We know that line WJL is a straight line, so all angles formed on it add up to $\ang{180}$.

We know that angle WJH is $\ang{18}$ and angle HJG is $\ang{90}$ (right angle), so that leaves angle GJL to be:

$18 + 90 + GJL = 180$

$108 + GJL = 180$

$GJL = 72$

Now we can solve for $x$:

$GJL = 9x = 72$

$9x = 72$

$x = \frac{72}{9}$

$x = 8$