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(4x)^2 + (3x)^2 = 20^2
16x^2 +9x^2 = 400
25 x^2 = 400
x^2 = 400/25
x= akar (16) = 4
4x= 4.4 =16
3x= 3.4 = 12
K = 16 + 12 + 20 = 48 cm