What is the equation for a circle

The video tutorial covers the equations of circles in a Cartesian coordinate system. It begins by explaining the general equation of a circle with its center at the origin, where the formula is x^2 + y^2 = r^2. The tutorial then introduces the equation for circles with centers not at the origin, using the formula (x-h)^2 + (y-k)^2 = r^2, where (h, k) is the center. The instructor emphasizes understanding these formulas and provides practice problems for students to solve, encouraging active participation and problem-solving skills.

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