Question

find the value of x.
(there is a quadrilateral with angles 131°, 86°, 68°, and x°)

Explanation:

Step1: Recall quadrilateral angle sum

The sum of interior angles of a quadrilateral is $360^\circ$.

Step2: Sum known angles

Calculate total of given angles:
$131^\circ + 86^\circ + 68^\circ = 285^\circ$

Step3: Solve for $x$

Subtract sum from $360^\circ$:
$x = 360^\circ - 285^\circ$

Answer:

$85$