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= 60/360 x phi x r x r
= 1/6 x 3,14 x 30 x 30
= 471 cm^2
luas segitiga
a = 30 cm
t = 15 akar3 cm
luas segitiga = 1/2 x a x t
= 1/2 x 30 x 15 akar3
= 225 akar3
= 389,5 cm^2 (dibulatkan)
luas yang diarsir
= 471 - 389,5
= 81,5 cm^2 (B)