Medium Math Class 9 Level 3

In an isosceles triangle each base angle is 72°. What is the vertex angle?

समद्विबाहु त्रिभुज में प्रत्येक आधार कोण 72° है तो शीर्ष कोण कितना होगा?

A) 36° / 36° B) 46° / 46° C) 54° / 54° D) 72° / 72°
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Correct Answer

A. 36° / 36°

Explanation

The angle sum is 180° so the vertex angle is 180° - 144° = 36°.

त्रिभुज का योग 180° है इसलिए शीर्ष कोण 180° - 144° = 36°।

Related Questions

Easy Math Class 10 Level 1

What is the area of a circle with radius 7 cm when π = 22/7?

7 सेमी त्रिज्या वाले वृत्त का क्षेत्रफल कितना होगा जब π = 22/7 हो?

A. 44 सेमी² / 44 cm² B. 77 सेमी² / 77 cm² C. 154 सेमी² / 154 cm² D. 308 सेमी² / 308 cm²
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