Mathematics
Grade-7
Easy

Question

Determine the radius of the circle with an area of 28.26 square feet.

  1. 9
  2. 3
  3. 14
  4. 7

The correct answer is: 9


    Area of the circle = πr squared
    πr squared space equals space area
area space is space given space that space is space 28.26 space square space feet
πr squared space equals 28.26
3.14 space cross times space straight r squared space equals space 28.26
straight r squared equals space fraction numerator 28.26 over denominator 3.14 end fraction
straight r squared space equals space 9
so space straight r space equals space plus-or-minus 3
but space the space radius space of space the space circle space should space be space positive
so space straight r space equals space 3

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