Equation of circle with center

label Algebra
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What is the equation of a circle with center (8, 4) and radius 7?

May 16th, 2015

The equation  of a circle with  the center at (h, k) and radius r given by the general formula:

(x – h)^2 + (y – k)^2 = r2

h = 8

k= 4

r = 7

So the equation will be (x - 8)2 + (y -4)2 = 49

I am expanding.....I will submit within 3 mins

May 16th, 2015

(x - 8)2 + (y -4)2 = 49

(x - 8)2  = x2 -16x  + 64

(y -4)2 = y2 - 8y + 16

x2 + y2 -16x -8y + 64 +16 = 49

x2+y2-16x -8y+ 80-49=0

x2 + y2 -16x -8y +31 = 0.


May 16th, 2015

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May 16th, 2015
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