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hypotnuse is 90


= perpendicular side/base=15/8

let perpendicular side is 15x and base is 8x

then, the formula of right angle triangle is,

         (perpendicular side)^2 + (base)^2 = (hypotnuse)^2

         (15x)^2 + (8x)^2 = (90)^2

now just find the x and find the perpendicular side(15x).
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