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luas kolam = phi x r^2 = 22/7 x 7 x 7 = 154
luas luar kolam = 400 - 154 = 246cm^2
maaf kalau salah
SXS=20X20=400
Luas
Luas Kolam
PhiXR^2=22/7X7X7=154
Luas luar kolamnya itu=400-154=246CM^2
Sorry kalo salah