CIRCLES

Question 1

a circle is a plane figure consisting of all points equidistant from a fixed point called

Answer 1

center

Question 2

the distance of the points from the center is called

Answer 2

the radius

Question 3

a point P(x,y) is on this circle if and only if

Answer 3

r = √(x-h)²+(y-k)²

• r is never negative
• r=radius
• (h,k) is the center

Question 4

standard form of the equation of a circle of a radius r and center (h,k)

Answer 4

(x-h)²+(y-k)²=r²