(i) sin A, cos A
(ii) sin C, cos C
How to solve NCERT Class 10 Chapter 8 Introduction to Trigonometry Question?
Exercise 8.1
Question No. 1
Page No. 181
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In △AABC, by Pythagoras theorem, we have
AC² = AB²+BC²
= (24 cm)²+(7 cm)²
= (576 + 49)cm²
= 625 cm²
⇒ AC = √625 = 25 cm
(i) sin A = BC/AC = 7/25 and cos A = AB/AC = 24/25
(ii) sin C = AB/AC = 24/25 and cos C = BC/AC = 7/25
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