Jawabanmu

2014-08-22T12:52:46+07:00
2014-08-22T13:06:32+07:00
Pi × r^2 = 346,5
22/7 × r^2 = 346,5
r^2 = 346,5 × 7/22 = 110,25
r = 110,25^0,5 = 10,5

Keliling alas = 2×pi×r = 2 × 22/7 × 10,5
= 21 × 22/7 = 3 × 22 = 66

Luas selimut tabung = keliling alas × tinggi tabung = 66 × 12 = 792 cm^2
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