Question

Can someone help me with this question? Thank you!

Answer 1

20°

Explanation:

The Angle Sum Property of a triangle gives that the sum of the internal angles of a triangle is equal to 180°.

Hence,

⇒ ∠A + ∠B + ∠C = 180°

⇒ ∠A + 120° + 40° = 180°

⇒ ∠A + 160° = 180°

⇒ ∠A = 20°

Answer 2

20°

Explanation:

A triangle = 180°

∴ 180° -120°-40°

=20°