EC = 9 in.
CD = in.
Find ED
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Without a type of triangle and the associated angle measurements, an answer is impossible.
Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)
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One side is not enough. For a right triangle the third side can be calculated by Pythagoras' Theorem if you know the length of any two sides.
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