Augh i suck at this topic

x = 18

Step-by-step explanation:

The given angle is a right-angled triangle.

Such triangles have an angle that equals 90°.

The square attached at the base represents 90°. [Whenever you such a square between two sides, simply put the angle between those sides equal to 90.]

So, the points we know about this triangle:

*Property*

The sum of all angles in a triangle = 180

==> 90 + 72 + x = 180

==> 162 + x = 180

==> x = 180 - 162

==> x = 18

c

step-by-step explanation: