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Calculate the radius of each ball to the nearest tenth. Use the formula

r = d/2

where r is the radius and d is the diameter. Record the average in Table A of your Student Guide.

What is the radius of the 4.2 cm diameter table tennis ball?

cm

What is the radius of the 4.0 cm diameter golf ball?

cm

1 answer

To calculate the radius using the formula \( r = \frac{d}{2} \), we can proceed with the following calculations:

  1. For the table tennis ball with a diameter of 4.2 cm: \[ r = \frac{4.2 , \text{cm}}{2} = 2.1 , \text{cm} \]

  2. For the golf ball with a diameter of 4.0 cm: \[ r = \frac{4.0 , \text{cm}}{2} = 2.0 , \text{cm} \]

Now, to summarize:

  • The radius of the 4.2 cm diameter table tennis ball is 2.1 cm.
  • The radius of the 4.0 cm diameter golf ball is 2.0 cm.