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Question

Question 1 (i)
In Δ ABC, right-angled at B, AB = 24 cm, BC = 7 cm. Determine:
(i) sin A, cos A

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Solution

In Δ ABC, B=90

By Applying Pythagoras theorem, we get:
AC2=AB2+BC2=(24)2+72=(576+49)cm2=625cm2
AC = 25
(i) sin A=BCAC=725,
cos A=ABAC=2425

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