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anonymous
 one year ago
What is the general form of the equation of a circle with its center at (2, 1) and passing through (4, 1)?
anonymous
 one year ago
What is the general form of the equation of a circle with its center at (2, 1) and passing through (4, 1)?

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freckles
 one year ago
Best ResponseYou've already chosen the best response.0An equation for a circle with center (h,k) and radius r is: \[(xh)^2+(yk)^2=r^2\] so plug in your h and k

freckles
 one year ago
Best ResponseYou've already chosen the best response.0then use the point on (4,1) to plug into (x,y) since (4,1) is on the circle to find r

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.0don't we also have (h,k) for the center ?

freckles
 one year ago
Best ResponseYou've already chosen the best response.0yep that is the first step "plug in your h and k"

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.0so since we have (2,1) in the form of (h,k) we let h =2, and k = 1

freckles
 one year ago
Best ResponseYou've already chosen the best response.0yes that is the h and k since my center of my equation I have above is (h,k) and the center of his is (2,1) so yep he needs to replace h with 2 and k with 1
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