Lesson: 10 – 8 Equations of Circles

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Presentation transcript:

Lesson: 10 – 8 Equations of Circles Geometry Lesson: 10 – 8 Equations of Circles Objective: Write the equation of a circle. Graph a circle on the coordinate plane.

How do you find d?

Equation of a Circle Standard Form (center-radius form) Copy all Equation of a Circle Standard Form (center-radius form)

Write an equation using the center and radius. Center at (1, -8) radius 7

Write an equation using the center and radius.

Write an equation using the center and radius. Center at origin, radius

Write the equation of each circle Center at (-2, 4) passes through (-6, 7) Use the distance formula to find the radius.

Center: (4, -1) Radius: 3 Center: (0, 0) Radius: 2 For each circle with the given equation, state the coordinates of the center and the measure of the radius. Then graph. Center: (4, -1) Radius: 3 Center: (0, 0) Radius: 2

Homework Pg. 746 2 – 8 E, 12 – 24 E, 46 – 52 E