Review on Equations of a Circle in Standard Form

What is the equation of a circle in standard form?

• ax²+bx+c=0

• (x-h)²+(x-k)²=r²

• (x-h)+(y-k)=r²

• x²+y²+ax+by+c=0

What is the center coordinate found in the equation in standard form?

• (x,y)

• (x²,y²)

• (h,k)

• (h,r)

Where is the radius in the equation of a circle in standard form?

• r

• x

• y

• h

If the center of the circle is at origin, the equation would be...

• x²+y²=r

• x²+y²=0

• x+y=r²

• x²+y²=r²

If the center of the circle is (1,1) and has the radius of 1, what is the equation?

• (x-1)²+(y-1)²=1

• (x-1)²+(y+1)²=1

• (x+1)²+(y-1)²=1

• (x-1)²+(y-1)²=-1

What is the center and radius in this image?

• C(-7,3) ; r=3

• C(7,-3) ; r=3

• C(7,-3) ; r=9

• C(-7,3) ; r=9

What is the center and radius of this image?

• C(3,-5) ; r=16

• C(-3,5) ; r=16

• C(3,-5) ; r=4

• C(-3,5) ; r=4

What is the correct graph for the equation (x-4)²+(y-2)²=25?

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What is the correct graph for the equation x²+y²=4?

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• Answer is in none of the given

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If the radius is greater than 0, then...

• there is only a point

• there is only a line

• there is no circle

• there is always a circle