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(64)phi = r^2
r = akar pangkat dua dari 64
r = 8 cm
diameter = 2 × r = 2 × 8 cm = 16 cm
4. luas persegi panjang =
8 cm × 6 cm = 48 cm2
luas lingkaran =
3,14 × 3 cm × 3 cm = 28,26 cm2
luas daerah yang diarsir =
48 cm2 - 28,26 cm2 = 19,74 cm2