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 wheel is 1.4 decimeter. How many times does it go around during a journey of 0.66 km?

    Right Option : B
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    Explanation
    Question : 2

    The ratio of the radius of 2 circles 3:2. What is their circumference ?

    Right Option : C
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    Explanation
    Question : 3

    The radius of circle is 14 m, then the circumference of a circle is:

    Right Option : B
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    Explanation
     
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