Question

Can someone help me understand what this means

Answer 1

∠C = 20° & ∠B = 40°

Explanation:

let angle c be x

A.T.Q ∠B = 2x

Using angle sum property of triangle

∠A + ∠B + ∠C = 180

120° + 2x + x = 180

3x = 60

x = 20°

∴ ∠C = 20

∠B = 40

Answer 2

∠ B = 40° , ∠ C = 20°

Explanation:

the 3 angles in the triangle sum to 180° , that is

∠ A + ∠ B + ∠ C = 180° ( substitute ∠ B = 2 ∠C )

∠ A + 2 ∠ C + ∠ C = 180°

120° + 3 ∠ C = 180° ( subtract 120° from both sides )

3 ∠ C = 60° ( divide both sides by 3 )

∠ C = 20°

∠ B = 2 × ∠ C = 2 × 20° = 40°