Question

What is the area of the toy bicycle wheel if the radius is 1 inch ?

Answer 1

Answer:
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1)  The area, in terms of "π" , is:  " 1π  in.² "  .
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2)  The area, using the approximation of  "3.14"  for "π" , is:  " 3.14 in.²  " .
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Explanation:
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The formula/equation of the area of a circle, "A":
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A = π * r² ;
 
 in which π ≈ 3.14 ; 
               A = Area; 
               r = length of radius = 1 in. (given). 
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  To find the area, take our known values, and plug them into the formula to find our answer:
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1)  To solve for the Area, in terms of "π" ;
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   A = π * r²  = π *(1 in.) ² = π * 1 in² ;
 
   A = 1π  in.²  .
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2) To solve for Area, using the approximation of "3.14"  for "π"  :
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   A = π * r² ;
 
   A ≈ (3.14) * (1 in.)²  =  (3.14) * (1²) * (in.²)  ;
      =  (3.14)*(1)*(in.²)  ;
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   A ≈  3.14 in.²
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