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maka :
a)
L selimut kerucut = 1177,5
phi.r.s = 1177,5
3,14.15.s = 1177,5
47,1.s = 1177,5
s = 1177,5 : 47,1
s = 25 cm
b)
Lp kerucut
= phi.r.(r+s)
= 3,14.15.(15+25)
= 3,14.15.40
= 1884 cm²