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990=2. 22/7. r. 15
990.7= 44r.15
6930= 660r
6930÷ 660=r
10.5= r
r= 10.5
luas selimut tabung= 990 cm
tinggi=15 cm
ditanya
jari-jari tabung?
jawab
luas selimut tabung=2×π×r×t
990=2×3,14×r×15
990=94,2×r
r=990/94,2
r=10,531 cm
Jadi, jari-jarinya adalah 10,531 cm