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kemudian cari luas setengah lingkaran pake rumus setengah x pi x r^2 = 157 cm^2
400 - 157 = 243
5.cari luas segitiga = 1/2 at = 72 cm^2
cari luas lingkaran = pi x r^2 = 28,26
72 - 28,28 = 43,74