Question

Find the missing angle, and name the type of the triangle.

• A. 60°; Equilateral triangle
• B. 60°; Isosceles triangle
• C. 60°; Scalene triangle
• D. None of the above

Answer 1

The correct option is A 60°; Equilateral triangle

In a triangle, the sum of the measures of the three interior angles is 180°.

Given, the angles are 60° each.

∴ Sum of the two given angles will be
= 60° + 60° = 120°

So, the third angle = 180° – 120° = 60°


In an equilateral triangle, we know the measure of every angle = 60°.

So, the triangle is equilateral.