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I'm confused about these questions. I don't know how I'm supposed to write an equation of a circle with the area/circumference and pi. Please show work because I really need help and to understand this. Please help.

 Sep 26, 2019

Best Answer 

 #1
avatar+19832 
+3

If circumference is 14 pi       

Circumf = pi * d   so d = circumf / pi = 14     radius = 7

 

Circle with center at h,k and radius r     formula  is  (x-h)^2 + (y-k)^2  = r^2   (remember that?)

 

(x-10)^2 + (y-7)^2 = 7^2

 

 

Area = pi r^2      400pi /pi = radius^2 = 400      r=20

(x+4)^2 + (y+5)^2 = 400                                                          (edited typo)

 

 

the last two are similar and youo should try them yoursefl 

 Sep 26, 2019
edited by ElectricPavlov  Sep 26, 2019
 #1
avatar+19832 
+3
Best Answer

If circumference is 14 pi       

Circumf = pi * d   so d = circumf / pi = 14     radius = 7

 

Circle with center at h,k and radius r     formula  is  (x-h)^2 + (y-k)^2  = r^2   (remember that?)

 

(x-10)^2 + (y-7)^2 = 7^2

 

 

Area = pi r^2      400pi /pi = radius^2 = 400      r=20

(x+4)^2 + (y+5)^2 = 400                                                          (edited typo)

 

 

the last two are similar and youo should try them yoursefl 

ElectricPavlov Sep 26, 2019
edited by ElectricPavlov  Sep 26, 2019
 #2
avatar+104962 
0

Thanks, EP!!!!!....nice explanation....

 

 

cool cool cool

CPhill  Sep 26, 2019

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