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r2: 346,5:22/7
r2: 356.4 X 7 : 22
r2: 110,25
r: 10.5(r2: 110,25)
L. selumut: 2 . phi .r . t
: 2 X 22/7 X 10.5 X 12
: 56 cm2
l. lingkaran = phi .r .(2)
346,5 = 22/7. r2
r2 = 34,5 / 22/7
r = 10,5 cm
l selimut = 2.phi.r.t
= 2. 22/7.10,5.12 = 792 cm2