Question

if sinA = 5/13 find cos A​

Answer 1

Answer:

Sin A = 5/13

PERPENDICULAR/ HYPOTENUSE = 5/13

therefore P=5

H=13

Using pythagoras theorem we get BASE = 12

now COSA = B/H

= 12/13

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Answer 2

Answer:

=12/13

Step-by-step explanation:

we know that

sin^2A+cos^2A=1

(5/13)^2+cos^2A=1

cos^2A=1-25/169

=144/169

cosA=12/13------------by squre roor

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