Mathematics
Grade-7
Easy

Question

The circumference of a circular ring is 25 meters. Determine the area of the rug.

  1. 12.5
  2. 49.73
  3. 85.24
  4. 45.7

hintHint:

circumference = 2πr

The correct answer is: 49.73


    C equals 2 pi r
2 pi r equals 25
2 cross times 3.14 cross times r equals 25
r equals fraction numerator 25 over denominator 6.28 end fraction
r equals 3.98
A r e a equals space pi r squared equals 3.14 cross times 3.98 squared
equals 3.14 cross times 15.84
equals 49.73 text  square meter.  end text

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