Mathematics
Grade-7
Easy

Question

The area of a circle is 154 square feet. Determine its perimeter.

  1. 28
  2. 12
  3. 39
  4. 44

hintHint:

area of circle = πr squared
circle of perimeter = 2straight pir

The correct answer is: 44


    Area = πr squared
    πr squared space equals space 154 space square space meter
22 over 7 space cross times space straight r squared space equals space 154 space space space space left parenthesis space because space straight pi space equals space 22 over 7 space right parenthesis
straight r squared space equals fraction numerator 154 space cross times 7 over denominator 22 end fraction
straight r squared space equals space 7 space cross times space 7
straight r squared space equals space 7 squared
so space straight r space equals space 7 space feet
we space know space the space circle space of space straight a space perimeter space is space 2 πr
so space perimeter space equals space 2 πr
space space space 2 space cross times space 22 over 7 space cross times space 7
perimeter space equals space 44 space feet space answer

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