Sebutkan tabung memiliki jari-jari 7 cm dan tinggi 10 cm tentukanlah volume dan luas permukaan !
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Penyelesaian
Diketahui
Ditanya
Dijawab
V = πr² x t
V = 22/7 x 7 x 10
V = ( 22 x 7 x 10 ) ÷ 7
V = 1.540 ÷ 7
V = 220 cm³
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LP = 2 x π x r x ( r + t )
LP = 2 x 22/7 x 7 x ( 7 + 10 )
LP = 2 x 22/7 x 7 x 17
LP = ( 2 x 22 x 7 x 17 ) ÷ 7
LP = ( 44 x 119 ) ÷ 7
LP = 476 ÷ 7
LP = 68 cm²
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