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Ls kerucut = 188,4
phi x r x s = 188,4
3,14 x r x 10 = 188,4
31,4 x r = 188,4
r = 188,4 : 31,4
r = 6 m
b)
Lp kerucut
= phi x r x (r+s)
= 3,14 x 6 x (6+10)
= 18,84 x 16
= 301,44 m²