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= 22/7 * 33 * 33
= 3422,5 m^2
L= phi*r*r
= 22/7 * 30 * 30
= 2828,5 m^2
Luas jalan= 3422,5 m^2 - 2828,5 m^2 = 594 m^2
maaf kalau salah