Mathematics
Grade-7
Easy

Question

Determine the radius of a circular swimming pool having 66 feet distance around it.

  1. 2.56
  2. 1.98
  3. 10.5
  4. 11

hintHint:

The distance around it is the circumference
The circumference of the circle is given by 2 cross times straight pi cross times straight r .

The correct answer is: 10.5


    straight C equals 2 pi straight r comma
2 pi straight r equals 66 comma
2 cross times 22 over 7 cross times straight r equals 66 comma
straight r equals 66 cross times 7 over 22 cross times 1 half comma
straight r equals 10.5 text  feet  end text

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