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GRE - Quantitative Reasoning - Geometry

What is the length of a diagonal of a rectangle that has width 5 and perimeter 34 ?

What is the length of a diagonal of a rectangle that has width 5 and perimeter 34 ?

perimeter = 2(length + width)

34 = 2(length + 5)

length = 12

diagonal of a rectangle (from pythagorus theorem) = (length2 + width2)1/2 = (122 + 52)1/2 = 13