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LS kerucut =
πrs
22/7 x 7x 25
=550
Luas lingkaran luar kerucut
Diameter = 14+3+3= 20
r = 10
πr²
= 3,14 x10x10
=314
luas lingkaran alas kerucut
πr²
22/7 x 7x7
=154
luas lingkaran nya = 314-154 = 160
kenapa di kurang? soalnya tengah nya bolong.
jadi luas kertas yg di perlukan 550+ 160 = D. 710
besok aku juga un semoga sama sama sukses yaa hehe