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Luas setengah lingkaran = 1/2 phi r^2 = 1/2 × 22/7 × 10,5^2= 22/14 × 110,25 = 173,25 cm^2
Luas yang diarsir = luas persegi - luas setengah lingkaran = 588 - 173,25 = 414,75 cm^2 (D)
26. Luas = phi r^2
9.856 = 22/7 × r^2
3.136 = r^2
r = 56 m (A)