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maka :
L = 1/2 π x r²
= 1/2 3,14 x 14²
= 1/2 x 615,44
= 307,72
maka luas y diarsir = (307,72 / 5 ) x 2 = 123, 2 cm² (A)
2. Dik :
p = 8 dm
l = 8 dm
t = 10 dm
Volume = p x l x t
= 8 x 8 10
= 640 dm³
disisi 1/5 = 640 x 1/5 = 128
jadi air yang dibutuhkan = 640 - 128 = 512 (C)