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12 x 12 = 144 cm
Luas lingkaran:
3,14 x 12 x 12 = 452,16 cm
Luas seperempat lingkaran:
452,16:4 = 113,04 cm
Luas daerah yang diarsir:
144 - 113,04 = 30,96 cm
Jawaban: A. 30,96 cm
= 12 x 12
= 144 cm²
L2 = x r x r : 4
= 3,14 x 12 x12 : 4
= 113,04 cm²
Larsir = L1 - L2
= 144 - 113,04
= 30,96 cm²