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Verified answer
Misal sisi yang lain = x, makax^2 + 16^2 = 20^2
x^2 + 256 = 400
x^2 = 400 - 256
x^2 = 144
x = akar 144
x = 12 cm
keliling = 2x + 2.16
= 2.12 + 2.16
= 24 + 32
= 56 cm