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Phi x r x r
22/7 x 14 x 14 = 616 cm²
Luas kolam
22/7 x 7 x 7 = 154 cm²
616 - 154 = 462 cm²
Luas lingkaran 1 = r²
Luas 1 = x 14 x 14
Luas 1 = x 196
Luas 1 = 22 x 28
Luas 1 = 616cm
Luas 2 = r²
Luas 2 = x 7 x 7
Luas 2 = 22 x 7
Luas 2 = 154cm
Luas Lingkaran luar = 616 - 154 = 462cm