Jawabanmu

Jawaban paling cerdas!
2014-09-13T19:58:54+07:00
Luas permukaan kerucut =  \pi r (r+s)
438,815 dm² = 3,14×6,5 (6,5+s)
6,5 + s = 438,815 ÷ (3,14×6,5)
6,5 + s = 438,815 ÷ 20,41
6,5 + s = 21,5
s = 21,5 - 6,5
s = 15 dm

Luas selimut kerucut =  \pi rs = 3,14×6,5×15 = 306,15 dm²

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