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Luas permukaan = 4 π r²
= 4 x 22/7 x 4cm x 4cm
= 1408/7 cm²
= 201 1/7 cm²
lp = 4x22/7x16
lp = 88/7x16
lp = 1408/7
lp = 20,114
2) diameter = 2xr
d=2x4
d=8cm