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L selimut kerucut = 188,4
phi.r.s = 188,4
3,14.r.10 = 188,4
31,4.r = 188,4
r = 188,4 : 31,4
r = 6 cm
b)
Lp kerucut
= phi.r.(r+s)
= 3,14.6.(6+10)
= 3,14.6.16
= 301,44 cm²