## Circle Equations

Take the square root: (y−2) = ± √ [25 − (x−4)2] (notice the ± plus/minus there can be two square roots!) Move the −2 to the right: y = 2 ± √ [25 − (x−4)2] So when we plot these two equations we should have a circle: y = 2 + √ [25 −
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Equation Of A Circle

Geometry Circles Circles, arcs, chords, tangents Interactive & Exploratory Activities Share this Graph A . B = C . D 7.5 * 7.5 = 7.5 * 7.5 56.25 = 56.25 Product Segments Chords Arc of a Circle Also Central Angles Area of Circle π ⋅ r 2

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## Equations of Circles

Given: Radius of a circle = 21 units Using geometry formulas for circle, Area of circle = π×r 2 = 3.142857 × 21 2 = 1385.44 Now for the circumference of the circle, Using geometry formulas for circle, Circumference of a Circle = 2πr =

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The standard equation of a circle is given by: (x-h)2 + (y-k)2 = r2 Where (h,k) is the coordinates of center of the circle and r is the radius. Before deriving the equation of a circle, let us focus on what is a circle? A circle is a set of all points which

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