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r= 15cm
dit= s
l. p. kerucut
jawab= l. s=Πrs
1.777,5=22/7×15×s
1.777,5=47,1×s
s=1.777,5/47,1=37,7cm
l. p. kerucut= Πr(s+r)
=22/7×15(37,7+15)
=47,1×52,7
=2482,17cm²