Medium Math Class 9 Level 6

In an isosceles triangle each base angle is 49°. What is the vertex angle?

समद्विबाहु त्रिभुज में प्रत्येक आधार कोण 49° है तो शीर्ष कोण कितना होगा?

A 72° / 72° B 82° / 82° C 92° / 92° D 98° / 98°
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Correct Answer

B. 82° / 82°

Explanation

The angle sum is 180° so the vertex angle is 180° - 98° = 82°.

त्रिभुज का योग 180° है इसलिए शीर्ष कोण 180° - 98° = 82°।

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