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= 3,5^2 + 12^2
=12,25 + 144
=156,25= 12,5 cm
L.p.kerucut= phi x r x s
= 22/7 x 3,5 x 12,5
= 137,5 cm2
atau
L.p.kerucut= phi x r x s
= 3,14 x 3,5 x 12,5
= 137,375 cm2
maaf kalo jawabannya salah
11.16= 176