Mathematics
Grade-7
Easy

Question

Determine the area of circle with a circumference of 25.12 meters.

  1. 50.24
  2. 48.2
  3. 42.89
  4. 29.41

hintHint:

circumference of a circle = 2 πr
area of a circle = πr squared  ( where r is the radius of the circle

The correct answer is: 50.24


    C i r c u m f r e n c e italic equals italic 2 pi r
italic 2 pi r italic equals italic 25 italic. italic 12 italic space italic space italic space italic space italic left parenthesis italic space g i v e n italic space italic right parenthesis
italic 2 italic cross times italic 3 italic. italic 14 italic cross times r italic equals italic 25 italic. italic 12
r italic equals fraction numerator italic 25 italic. italic 12 over denominator italic 6 italic. italic 28 end fraction
r italic equals italic 4
text italic  Area  end text italic equals pi r squared
a r e a italic equals italic 3 italic. italic 14 italic cross times italic 4 italic space italic cross times italic 4
italic space italic space italic space italic space italic space italic space italic space italic space italic space italic equals italic 3 italic. italic 14 italic cross times italic 16
italic space italic space italic space italic space italic space italic space italic space italic space italic equals italic 50 italic. italic 24 text italic  square meters.  end text

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