Find the radius of a circle whose circumference is 79.2 cm. Given that
2 2
n =—
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Given:
- Circumference of a circle is 79.2 cm.
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To find:
- Radius of the circle.
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Solution:
- As we have circumference of the circle, i.e., 79.2 cm.
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Formula for circumference of circle is :-
★ Circumference = 2πr
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→ Circumference = 79.2
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→ 2πr = 79.2
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→ 2 × 22/7 × r = 79.2
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→ 22/7 × r = 79.2/2
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→ 22/7 × r = 39.6
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→ 22r = 39.6 × 7
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→ 22r = 277.2
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→ r = 277.2/22
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→ r = 12.6
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Hence,
- Radius of the circle is 12.6cm.
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⠀⠀⠀⠀⠀⠀⠀⠀⠀Some Formulae
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→ Area of square = (side)²
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→ Area of rectangle = length × breadth
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→ Area of triangle = ½ × base × height
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→ Area of parallelogram = base × height
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→ Area of Circle = πr²
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