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sisi = 5
keliling belah ketupat = 4 x sisi = 4 x 5 = 20 cm
sisi^2 = 4^2 + 3^2
sisi^2 = 16 + 9
sisi^2 = 25
sisi = akar dari 25 = 5
Keliling = 4 x sisi
= 4 x 5 = 20 cm (C)
^ = pangkat