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LESSON 2.2 – GRAPHS OF EQUATIONS IN TWO VARIABLESStandard form of aCircleThe point (x, y) lies on the circle of radius r and2 2 2x h yk rcenter (h, k) iff Center:Radius:Practice Problems: Write the standard form for the following circles.1. The point (3, 4) lies on a circle whose center isat (-1, 2).2. Endpoints of a diameter: (-4, -1), (4, 1).Practice Problems: Complete the square, if necessary, to find the center and radius. Then draw the graph.3.2 2x y 8x6y 04.2 2x y 4x805.2 2x y 2x4y<strong>11</strong> 06.2 2x y 6x2y150Mrs. Nguyen – Honors Algebra II – Chapter <strong>11</strong> <strong>Notes</strong> – Page 3
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