The diameter of the larger circle is 12.5 cm. the diameter of the smaller circle is 3.5 cm. what is the approximate area of the larger circle?

The answer is:  " 122.65625 cm² " ; or, write as:  " 122   cm² " .
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Note: 
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The area, "A", of a circle:

 A =  * r² ;

           in which:  A = area of the circle; 

                             = 3.14 ; 

                            r = radius ;

To calculate radius, "r" = diameter/2 = 12.5 cm/2 = 6.25 cm .

                           r = 6.25 cm ;

So, to calculate the area, "A" of the circle:

A =  * r²  ;

Plug in the values to find the Area, "A" of the circle:

A = 3.14 * (6.25 cm)²  ; 

A = 3.14 * (6.25)² * cm² ;

A = 3.14 *  39.0625 * cm² ;   Note that "39.0625" = "" .

A = 122.65625 cm²  ; or, write as:  " 122   cm² " .
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