Question

the three angles in triangle A and B and C are labelled A= 2x B=3x C=4x 1. calculate x 2. find the actual angle of B 3. find the exterior angle to b

Answer 1

Answer:

1). x = 20° ; 2). m∠B = 60° ; 3). 120°

Step-by-step explanation:

m∠A + m∠B + ∠C = 180°

1). 2x + 3x + 4x = 180°

9x = 180° ===> x = 20°

2). m∠B = 3 × 20° = 60°

3). The exterior angle to ∠B is

180° - 60° = 120°