Sebuah tabung berdiameter 28 cm dengan tinggi 10 cm. Luas seluruh permukaan tabung adalah … ( π = 22/7 )
- Mencari r
→ d ÷ 2
→ 28 cm ÷ 2
→ 14 cm
- Luas permukaan
= 2πr(r + t)
[tex] \tt = 2 \times \frac{22}{7} \times 14 \times (14 + 10)[/tex]
[tex] \tt = \frac{616}{7} \times 24[/tex]
[tex] \tt = \frac{14.784}{7} [/tex]
= 2.112 cm²
[tex] \pink{\boxed{\red{\boxed{\purple{\mathfrak{\ast ~ \blue{Celia ~ Claire} ~ \ast}}}}}}[/tex]
Penyelesaian:
D=28cm
R=14cm
T=10cm
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Lp?
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Lp=2×La+K×T
Lp=2Πr²+2Πrt
Lp=2Πr(r+t)
Lp=2×22/7×14(14+10)
Lp=2×22×2(24)
Lp=44×48
Lp=2.112cm²
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[tex] \boxed{ \colorbox{black}{ \sf{ \color{lightgreen}{ answered\:by\:Duone}}}} [/tex]
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