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Verified answer
Luas alas = Lπ×r× r = L
π = L /( r×r)
r÷s = 2÷3 atau 2a ÷ 3a
Luas Kerucut
= luas alas + luas selimut
= L + π x r x s
= L + L / ( 2a×2a) x 2ax 3a
= L + (3/2)× L
= (5/2) × L