Question

Find the surface area of a cylinder whose base radius is 14 cm height is 28cm.​

Answer 1

Given:-

• Base radius of a cylinder = 14 cm
• Height of a cylinder = 28 cm

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To find:-

• Surface area of a cylinder.

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Solution:-

Here,

• Radius (r) = 14 cm
• Height (h) = 28 cm

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☆Surface area = 2πr(r + h)

⇛ 2 × 22/7 × 14(14 + 28)

⇛ 2 × 22 × 2 × 42

⇛ 3696 cm²

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Hence,

• the surface area of a cylinder is 3696 cm².

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★More Formulas

• Area of rectangle = length × breadth sq.units
• Perimeter of square = 4 × side units
• Area of square = side × side sq.units
• Perimeter of circle = 2πr units
• Area of circle = πr² sq.units
• Perimeter of parallelogram = 2 × (a + b) units
• Area of parallelogram = base × height sq.units
• Perimeter of rhombus = 4 × side units
• Area of rhombus = 1/2 × diagonal (1) × diagonal (2) sq.units
• Perimeter of equilateral triangle = 3 × side units
• Area of equilateral triangle = √3/4 × a² = 1/2 × side × height sq.units
• Perimeter of trapezoid = (Sum of all sides) units
• Area of trapezoid = 1/2 × height × (sum of parallel sides) sq.units

Answer 2

$\huge \bf \purple {GIVEN:}$

Radius = 14cm

Height = 28cm

$\small \fcolorbox {green}{yellow}{Surface\: area\: of\: Cylinder\: = \:2πr(r+h)}$

Surface area of given Cylinder = 2π×14(14+28)

= 2×(22/7)×14×(42)

= (44)×2×42

= 88× 42

= 3696 cm sq.