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353,25 = 3,14 × 7,5 × s
353,25 = 23,55s
s = 353,25/23,55
s = 15
luas.p.kerucut = phi × r ( r+s)
= 3,14×7,5 (7,5+15)
= 23,55 (22,5)
=529,875