Question

Exercise - 8.1
If in a right angled triangle ABC, ZB is a right angle; then find the value of sin A, cos C and
tan A.
Given:-
AC=5 AB=3 BC=4​

Answer 1

Step-by-step explanation:



Introduction to Trigonometry

Question-1 :- In Δ ABC, right-angled at B, AB = 24 cm, BC = 7 cm.

Determine : (i) sin A, cos A  (ii) sin C, cos C

Solution :-

Given :

In Δ ABC, right-angled at B, AB = 24 cm, BC = 7 cm, AC = ?

By Pythagoras Theorem :

AC² = AB² + BC²

= (24)² + (7)²

= 576 + 49

= 625

AC = 25 cm

NCERT Math

(i) sin A, cos A

sin A = BC/AC = 7/25

cos A = AB/AC = 24/25

(ii) sin C, cos C

sin C = AB/AC = 24/25

cos C = BC/AC = 7/25

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