Circles

Explanation

A circle is the set of all points in a plane that are equidistant from a fixed point, called the center.

Standard equation of a circle:
(x − h)² + (y − k)² = r²

Where:

• (h, k) = center of the circle

• r = radius

Example:
(x − 2)² + (y + 3)² = 16

• Center: (2, −3)

• Radius: 4