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Hipotenusa^2=sisi^2+sisi^2 atau c^2=a^2+b^2
berarti
20^2= (4x)^2 + (3x)^2
400 =16x^2 + 9x^2
400 =25x^2
16 = x^2
4 = x
4x = 4(4) = 16
3x = 3(4) = 12
sehingga Keliling
K=20+16+12
K=48