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s = √12² + 4²
= √ 144+16
= √160
= 12,65 cm
luas permukaan
Lp = π x r² + ( π x r x s)
=( 3,14 x 4 x 4) + ( 3,14 x 4 x 12,65)
= 50,24 + 157
= 207,24 cm²