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You have to figure out the two sides. You must have the angles of the triangle and use the sin, cos, and tan functions to figure out the sides. Remember "Oscar Had a Hint of Apples?'

sin (x) = o/h

cos (x) = a/h

tan (x) = o/a

So, if the hypotenuse is the only side known, multiply the sin of the angle of the opposite side by the hypotenuse. This gives you the opposite side.

Then you can divide the tangent of the angle by the opposite side to get the adjacent side.

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Q: How do you find perimeter of triangle when two sides are not given?
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