Hard Math Class 9 Level 2

In an isosceles triangle the vertex angle is 3 times each base angle. What is the vertex angle?

समद्विबाहु त्रिभुज में शीर्ष कोण प्रत्येक आधार कोण का 3 गुना है। शीर्ष कोण कितना होगा?

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Correct Answer

C. 108° / 108°

Explanation

Let each base angle be x and vertex be 3x. Then x + x + 3x = 180° so x = 36° and vertex is 108°.

प्रत्येक आधार कोण x हो तो शीर्ष 3x है। x + x + 3x = 180° से x = 36° और शीर्ष 108° है।

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