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diketahui :
diameter lingkaran : 42
jari" lingkaran : 21
ditanya : luas 1/2 lingkaran
dijawab :
rumus luas lingkaran = 22/7 x jarijari x jarijari
luas kolam ikan = (22/7 x 21 x 21) / 2
= (1386)/2
= 693