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bab : bangun ruang sisi lengkung
diketahui :
- kll alas = 66cm
- tinggi tabung = 10cm
ditanya = luas sisi tabung ??
kll alas = 2πr
66 = 2 × 22/7 × r
66 = 44/7 × r
r = 66 × 7/44
r = 10,5cm
luas tabung : 2πr( r + t )
= 2 × 22/7 × 10,5 ( 10,5 + 10 )
= 2 × 22/7 × 10,5 ( 20,5 )
= 44/7 × 215,25
= 1353cm²
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