Question

Given the triangle below, select all true statements

Answer 1

first and fourth statements are true

Explanation:

the sum of the 3 angles in a triangle = 180° , so

2x + 1 + x + x + 15 = 180 , that is

4x + 16 = 180 ( subtract 16 from both sides ) ← True

4x = 164 ( divide both sides by 4 )

x = 41 ≠ 49

then

∠ A = 2x + 1 = 2(41) + 1 = 82 + 1 = 83° ≠ 99°

∠ C = x + 15 = 41 + 15 = 56° ← True