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Physics

You have a cricket ball, a string and a ruler. How will you find the radius of the ball?

Measurements

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Answer

To find the radius of the cricket ball :

  • Wrap the string around the circumference of the cricket ball once.
  • Mark the length of the string needed to go around the ball.
  • Lay the string straight along a ruler and measure its length which gives the measurement of circumference of the ball.

By using the formula,

Circumference = 2πr

where r is the radius and π ≈ 3.14.

Rearrange to find the radius :

r = 2πCircumference\dfrac{2 \text π}{\text {Circumference}}

Now, put measured value of circumference in the above formula to calculate the value of the radius.

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