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1.650 = 25 × keliling alas tabung
keliling alas tabung = = 66
Keliling alas tabung = Keliling lingkaran = 2πr
66 = 2πr = 2 × × r
r = ×
r = 33 × = 1,5 × 7 = 10,5
Jadi jari-jari alas tabung = 10,5 cm
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