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4.162-8.024+(-2.190+1.563)
= -3.862+(-627)
= -3.862-627
= -4.489 ... (b)
20)
L.daerah diarsir
= 3 x 1/8 x L.lingkaran
= 3/8 x phi x r²
= 3/8 x 22/7 x 28 x 28
= 924 cm² ... (b)