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=
=
=9
Ls = phi. r. s
= 3,14 x 9 x 15
r2 = 15(kuadrat) - 12(kuadrat)
= 225 -12
r =akar 81
r= 9
L.selimut = phi.r.s
= 3,14 × 9 × 15
=423,9cm2