Equations Of Circles

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CCGPS Geometry
Unit 8 – Modeling Geometry
8.1 – Notes
Name: ________________________________________________________ Date: _______________________
Equations of Circles
Standard Form of a Circle
2
2
x h
y k
r
2
General Form of a Circle
1. Write an equation of a circle with center (3, -2) and a radius of 4.
2. Write an equation of a circle with center (-4, 0) and a diameter of 10.
11
3. Write an equation of a circle with center (2, -9) and a radius of
.
 
2
2
x
6 +
y
3
25
4. Find the coordinates of the center and the measure of the radius.
Find center, radius, & equation of the circle.
5.
6.
Graph the circle, identify the center & radius.
2
2
x
3
y
2
9
7.

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