Question

you can use angle relationships to find the value of x. which equation shows that the angle measures in the triangle add up to 180°? 2x + 80 = 180 x + 80 = 180 3x = 180 80x = 180 x + x + 80 = 180

Explanation:

Step1: Use triangle angle - sum property

The sum of interior angles of a triangle is \(180^{\circ}\).

Step2: Express angles and sum them

The angles of the triangle are \(x^{\circ}\), \(x^{\circ}\), and \(80^{\circ}\). So, \(x + x+80 = 180\).

Answer:

\(x + x + 80=180\) (the equation in the pink box)