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luas selimut = Π.r.s
188,4 = 3,14. 6. s
188,4 = 18,84 . s
s = 188,4 : 18,84
s = 10
tinggi kerucut = s2 - r2
= 10.10 - 6.6
= 100 - 36
= 64
= √64
= 8
jadi tinggi kerucut 8cm