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Ex 8.1, 6 - If Angle A and Angle B	are acutes angles  such that cos A = cos b, then show that Angle A = Angle B

Ex 8.1, 6 - Chapter 8 Class 10 Introduction to Trignometry - Part 2

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Ex 8.1, 6 If A and B are acute angles such that cos A = cos B, then show that A = B. cos A = (Side adjacent of angle A) / Hypotenuse = AC/AB Similarly, cos B = (Side adjacent of angle A) / Hypotenuse = BC/AB Now it is given that cos A = cos B AC/AB = BC/AB AC = BC We know that in a triangle, angles opposite equal sides are equal B = A Hence proved.

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.