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= 1/4 ×22/7 ×49
= 1/4 ×22× 7 = 154/4 =38,5 cm².
c. 1/4πd² = 1/4 × 22/7 × ( 1,4 )²
= 1/4 × 22/7 × 1,4 ×1,4
= 1/4 × 22/7 × 1,96
= 1/4 × 22 × 0,28 = 1/4 × 6,16 = 6,16 / 4 = 1,54 cm².
maaf,, krena hanya 2 soal yng dpt sy krjkan. sy harap dari cara kerja sy, anda bisa mengerjkn dua nomor lainnya....