SAT Geometry: Equation of a Circle Explained

Equation of a circle: (x – h)² + (y – k)² = r².

On the SAT, this tells you everything:
• The center of the circle is (h, k).
• The radius is r.

Example: (x – 2)² + (y + 3)² = 25 → center (2, –3), radius 5.

SAT tips:
1) Watch the signs: (y + 3) means k = –3.
2) Make sure you take the square root of r² to find the radius.

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