geometry

What is the equation of a circle with its center at (10,−4) and a radius of 2?

a. (x+10)2+(y−4)2=4
b. (x−10)2+(y+4)2=2
c. (x+10)2+(y−4)2=2
d. (x−10)2+(y+4)2=4

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  1. if the centre is (a,b) and the radius is r, then the equation is
    (x-a)^2 + (y-b)^2 = r^2

    Memorize this.

    Which of the given choices matches this pattern?

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