CK12 - Geometry

Example 3

Find the centerand radiusof the followingcircles:

A.

B.

A. We rewritethe equationas: The centerof the circleis at point and

the radiusis.

B. We rewritethe equationas: The centerof the circleis at point

and the radiusis.

Example 4

Graphthe followingcircles:

A. B.

In orderto grapha circle,we first graphthe centerpointand then drawpointsthat are the lengthof the radius
awayfrom the center.

A. We rewritethe equationas: The centerof the circleis pointat and

the radiusis.

B. We rewritethe equationas: The centerof the circleis pointat

and the radiusis.