Question

What is the surface area of a hollow cylinder with outer radius 4cm,inner radius 3cm and height 5cm.
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Answer 1

$\sf\large{\underline{\underline{\red{Question:-}}}}$

What is the surface area of a hollow cylinder with outer radius 4cm,inner radius 3cm and height 5cm.

$\sf\large{\underline{\underline{\red{Given:-}}}}$

• Outer radius(R) = 4cm
• inner radius (r) = 3cm
• Height = 5cm

$\sf\large{\underline{\underline{\red{To\:Find:-}}}}$

• Surface area of hollow cylinder .

$\sf\large{\underline{\underline{\red{Solution:-}}}}$

$\sf→ 2π(R+r)(R-r+h)\\\sf→ 2×\frac{22}{7}(4+3)(4-3+5)\\\sf→ \frac{44}{7}×7×6\\\sf→ 44×6\\\sf→ Surface\:area= \large 264cm^2$