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kramer
3 years ago
5

8th grade math probability

Mathematics
1 answer:
kari74 [83]3 years ago
3 0
In problem 16 I think the answers is b
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What is the circumference of a circle with an area of 25??
Semmy [17]
Answer:  The circumference is:  " 8.87 square units " .
_________________________________________________
Explanation:
_____________________________________
Note the following:
________________________________
Area of a circle:  A = π r² = 25 units² ; 
 
Circumference of a circle:  C = π*d = 2πr
____________________________________
  If we can solve for "r" ("radius", we can solve for the "Circumference, "C") ;
__________________________________
   A = π r² = 25 ;

    C = 2 * π *r
 
   So:  " π * r * r = 25"  ;
________________________
 We know that:  " π * r * r = 25" ; 

Multiply EACH side of the equation by "2" ; 
__________________________________
      2*{ π * r * r = 25} ;
__________________________________
To get:  2 * π * r * r = 25 ; 

Note:  "C = 2* π * r ; 

So,  "(2 * π * r) * r = 25 " ; 

We want to solve for "C" ; so replace the "(2 * π * r) " ; with "C" ;
 
          C * r = 25 ; 
______________________________
Divide EACH SIDE of the equation by "r" ; to isolate "C" on one side of the equation:
________________________________
   (C * r) / r  =  25 / r   ;

to get:    C  =  25 / r ;  
____________________________________
Now, we need to find the value for "r" (the radius);
          to find "C" (the circumference).

We know that:  
____________________________________ 
   π * r² = 25 ;
____________________________________
Divide each side of the equation by "π"; to isolate "r² " on one side of the equation;
____________________________________
   (π * r²) / π  =  25 / π ;

To get:  
___________________________________________________
   r²  =  25/π  ;  Let us use "3.14" as an approximation for "π" ;
___________________________________________________
   r²  =  25 / (3.14) ; 
  
   r²  =  7.9617834394904459 ; 

Take the "positive" square root of EACH side of the equation; 
   (since the radius, "r", cannot be a negative value);
_____________________________________________

   +√(r²) = +√(7.9617834394904459) ; 
_____________________________________________
to get:
_____________________________________________
      r  =  2.8216632399155016635 ;  
              →  Round to:  " 2.82 " ; 
_____________________________________________
     C = 25 / r  ;
 
     C = 25 / (2.82) = 8.8652482269503546  square units .
                              →  Round to:  "8.87"  square units.
_____________________________________________
The answer is:  "8.87 square units" .
_____________________________________________
4 0
3 years ago
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