Keliling tabung = Keliling lingkaran.
= 2 × phi × r.
22= 2×22/7×r
22×7=2×22×r
154=44r
r= 154/44 = 3,5
luas permukaan tabung = 2×phi×r ( r + t )
= 2 × 22/7 × 3,5(3,5+9)
= 22×12,5 = 275cm²
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Penyelesaian
Keliling tabung = Keliling lingkaran.
= 2 × phi × r.
22= 2×22/7×r
22×7=2×22×r
154=44r
r= 154/44 = 3,5
luas permukaan tabung = 2×phi×r ( r + t )
= 2 × 22/7 × 3,5(3,5+9)
= 22×12,5 = 275cm²
[tex]by \: star97[/tex]