Question

one interior angle of a triangle is 43°, and the other two angles are congruent. choose the equation that could be used to determine the degree measure of one of the congruent angles.
2x + 43 = 180
2x - 43 = 90
x + 43 = 180
x - 43 = 90

Explanation:

Step1: Set up the equation

The sum of interior angles of a triangle is \(180^{\circ}\). Let the measure of each congruent angle be \(x\). Then \(x + x+43 = 180\), which simplifies to \(2x+43 = 180\).

Answer:

\(2x + 43=180\)