Question

In triangle ABC, `/_B=40°`, and `/_C=100°`. What is the measure of angle A?

Answer 1

`angleA=40^@`

Explanation:

In a triangle, the sum of the angles always adds up to `180^@`

`=> angle A + angleB + angleC=180^@`
`=> angleA+40+100=180`
`=> angleA=180-(40+100)=40^@`