Question

2) Two angles in a triangle are 80 degrees and 70 degrees. Find the missing angle measure. Please show your math work step by step and don’t forget the unit.

Answer 1

30°

Explanation:

Let the measure of missing angle be x°

`\therefore \: x + 80 \degree + 70 \degree = 180 \degree \\ \therefore \: x + 150 \degree = 180 \degree \\ \therefore \: x = 180 \degree - 150 \degree \\ \therefore \: x = 30 \degree`