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= 50
luas selimut
Ls = ( π x r x s ) - ( π x r x s)
= ( 22/7 x 14 x 14 x 50) - ( 22/7 x 7 x7 x 25)
= ( 44 x 14 x 50 ) - ( 22 x 7 x 25)
= 30800 - 3850
= 26950
luas alas
La = π x r²
= 22/7 x 7 x 7
= 22x 7
= 154
luas permukaan
Lp = 26950 + 154
= 27104 cm²