Answer:
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:
- One angle is = 90
- Another angle given in the question is 72°.
*Property*
The sum of all angles in a triangle = 180
==> 90 + 72 + x = 180
==> 162 + x = 180
==> x = 180 - 162
==> x = 18
