Question

find the value of x.

Explanation:

Step1: Confirm polygon type

The shape is a quadrilateral (4 sides).

Step2: Sum of interior angles

Sum = $(4-2) \times 180^\circ = 360^\circ$

Step3: Calculate x

$x + 86 + 105 + 118 = 360$
$x + 309 = 360$
$x = 360 - 309 = 51$

Answer:

51