Question

In an isosceles triangle if one angle is 80, find the measure of other two angles (in degrees).

• A. 60, 40
• B. 50, 50
• C. 90, 10
• D. 75, 25

Answer 1

The correct option is B 50, 50

If one of the angles is ${80}^o$, then the sum of the remaining angles is ${180}^o-{80}^o={100}^o$

As it is an isoceles triangle, two of the remaining angles are equal. And hence, each of the angles is $\frac{{100}^o}{2}={50}^o$