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# Circles

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2  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

#1
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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
0

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
0

Thanks, EP!!!!!....nice explanation....   CPhill  Sep 26, 2019