Question

Find the measure of the third angle in each of the following triangles.

Answer 1

A=80 B=60
A: Add 60+40 and subtract 180
B:90+30 and subtract from 180
Reason: triangles add up to 180

Answer 2

A = 80° and B = 60°

Explanation:

A) Since all the angles in a triangle add to 180°, do 180 -(40+60) = 80°

- 40 + 60 = 100

B) Since it's a right angled triangle, it tells us that one of the angles is 90°. So, you do

180 - (90+30) = 60°

30 + 90 = 120