Question

6a which expression represents the angle sum of the triangle? (10x + 7)+(6x + 20)-(11x - 9)=180 (10x + 7)+(6x + 20)-(11x - 9)=360 (10x + 7)+(6x + 20)+(11x - 9)=180 (10x + 7)+(6x + 20)+(11x - 9)=360

Explanation:

Step1: Recall the triangle - angle sum property

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

Step2: Set up the equation

If the angles of the triangle are \((10x + 7)^{\circ}\), \((6x+20)^{\circ}\), and \((11x - 9)^{\circ}\), then \((10x + 7)+(6x + 20)+(11x-9)=180\)

Answer:

C. \((10x + 7)+(6x + 20)+(11x-9)=180\)