Medium Math Class 9 Level 10

In an isosceles triangle each base angle is 39°. What is the vertex angle?

समद्विबाहु त्रिभुज में प्रत्येक आधार कोण 39° है तो शीर्ष कोण कितना होगा?

A 92° / 92° B 102° / 102° C 112° / 112° D 122° / 122°
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Correct Answer

B. 102° / 102°

Explanation

The angle sum is 180° so the vertex angle is 180° - 78° = 102°.

त्रिभुज का योग 180° है इसलिए शीर्ष कोण 180° - 78° = 102°।

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