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2 π r = 66
r = 66 : 44/7 = ²¹/₂
s = 20
Luas kerucut = luas alas + luas selimut = π r² + π r s
L = π r ( r + s)
L = ²²/₇ (²¹/₂) (²¹/₂ + 20)
L = 33 (30 ¹/₂)= 1.006,5