Answer on Geometry Question for maria prettymaths
The standard form equation of a circle is a way to express the definition of a circle on the coordinate plane.
Remember that a circle is a locus of points. A circle is all of the points that are a fixed distance, known as the radius, from a given point, known as the center of the circle.
On the coordinate plane, the formula becomes
(x-x0)² + (y-y0)² = R²,
where (x0;y0) is a the center of the circle. Here we used the Pythagorean theorem.
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