Circles

What is the standard equation of a circle with center (h, k) and radius r?

What is the center of the circle given by the equation (x - 3)² + (y + 5)² = 36?

What is the radius of the circle given by the equation (x + 2)² + (y - 4)² = 49?

Write the equation of a circle with center (0, 0) and radius 3.

What is the diameter of a circle with radius 10?

What is the center and radius of the circle given by the equation (x - 1)² + (y + 2)² = 25?

Write the equation of a circle with center (4, -8) and radius 5.

What is the equation of a circle with radius 4 and center (0, 8)?

What is the equation of a circle with center (-1, -1) and radius 3?

What is the center of the circle given by the equation x² + y² = 16?