there are three sides , side opposite to given angle (A) is opposite side or perpendicular (P)

side between angle and right angle is adjacent side or base(B)

side opposite to right angle is hypotenus(H)

sin A = P/H

cos A = B/H

tan A = P/B

see which side is given & which one to be find then use the appropriate trigonometric ratio .

after we have all the side length we can check by pythgorean theorem

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