Question

The sum of the measures of the three interior angles of any triangle is always 180°. The unmarked angles of the triangle below total 150°. angle A triangle.gif What is the measure of an angle that would be complementary to ∠ A ? A. 30° B. 60° C. 90° D. 150°

Answer 1

• <A be x

As rest angles have sum 150°

Using angle sum property

• x+150=180
• x=30°

Now

Complementary angles have sum 90°

So the complementary angle is 90-30=60°

Option B