Question

which of the following is an equation you could use to solve for x?
5x°
90°
4x°
the sum of the angle measures = 180°

Explanation:

Step1: Recall angle - sum property of triangle

The sum of interior angles of a triangle is 180°.
So, \(90 + 5x+4x=180\).

Answer:

\(90 + 5x+4x=180\)