Circumference of Circle


 
 
Concept Explanation
 

Circumference of Circle

Circumference of A Circle: To calculate the circumference of a circle, use the formula large C = pi ;d

  • where "C" is the circumference,
  • "d" is the diameter,
  • large and; pi =3.14 ;or = frac{22}{7}.
  • If you have the radius instead of the diameter, multiply it by 2 to get the diameter.

    You  can also use the formula for circumference of a circle using radius, which is large C = 2pi ;r

    Example: Find the circumference of the circle with a diameter of 8 inches.

    Answer: C = 3.14 X 8 = 25.163 inch.

    Example: Find the circumference of the circle with a radius of 5 inches.

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    Sample Questions
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    Question : 1

    The radius of a wheel of a vehicle is 2.52 cms. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle is

    Right Option : B
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    Explanation
    Question : 2

    A piece of wire in the form a rectangle with dimension 12 m and 10 m is bent to form a circle. Find the diameter of a circle.

    Right Option : C
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    Explanation
    Question : 3

    If the ratio of circumference of two circles is 5: 7, the ratio of their area is:

    Right Option : B
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    Explanation
     
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