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= (2 x phi x r x t) + (phi x r^2)
= (2 x 3,14 x 6 x 15) + (3,14 x 6^2)
= 565,2 + 113,04
= 678,24 cm2
maaf kalo jawabannya salah
= 3,14×6² + 2×3,14×6×15
= 113,04 + 565,2
= 678,24 cm²