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K = 2(23+12)
K = 2(35)
K = 70 cm
Sisi persegi;
s = 70/4 = 17,5 cm
4.s = 2.(p+l)
4.s = 2.(23+12)
4.s = 2.35
4.s = 70
s = 70/4
s = 17,5 cm