Question

A right triangle includes one angle that measures 30º. What is the measure of the third angle?

A. 30º
B. 90º
C. 60º
D. 130º

Answer 1

The answer is C.

Explanation:

So to get the answer add 90+30= 120

Then take 180-120=60 (which is your leftover angle)

Answer 2

C. 60º

Explanation:

A triangle is called a right triangle when one of it's angle measures 90°.

We have been given the second angle as 30°.

The angles in a triangle add up to 180°.

∴ leting the third angle to be X;

X + 30° + 90° = 180°

X + 120° = 180°

X = 180° - 120°

= 60°