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CBSE Class 10 Answered

Page 377 Ex 6 If ∠A and ∠B are acute angles such that cosA=cosB, then show that ∠A = ∠ B.
Asked by miniprasad | 23 Oct, 2018, 09:53: PM
answered-by-expert Expert Answer
 
begin mathsize 16px style cos space straight A space equals space AC over AB comma space cos space straight B space equals space BC over AB
It space is space given space that comma
cos space straight A space equals space cos space straight B
rightwards double arrow AC over AB equals BC over AB
rightwards double arrow AC space equals space BC
Angle space oppsite space to space the space equal space sides space are space equal.
angle straight A space equals space angle straight B
Hence space proved. end style
Answered by Yasmeen Khan | 24 Oct, 2018, 10:28: AM
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