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kll pp = 2 (24 + 12)
kll pp = 72
jika kll persegi pjg 2x kll persegi jadi kll persegi 72/2 = 36
kll persegi = 4s
36 = 4s
s= 36/4
s= 9
jawabannya b
K = 1/2 x 72 = 36
s = K/4 = 36 / 4 = 9 cm.