Equation of a Circle

Front

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

Back

Front

What does the 'h' in (h, k) represent in the equation of a circle?

Back

The 'h' represents the x-coordinate of the center of the circle.

Front

What does the 'k' in (h, k) represent in the equation of a circle?

Back

The 'k' represents the y-coordinate of the center of the circle.

Front

If a circle has a center at (3, -2) and a radius of 5, what is its equation?

Back

Front

How do you find the radius from the equation of a circle?

Back

Front

Back

Front

Back

The center is (2, -3).

Front

Back

Front

What is the general form of the equation of a circle?

Back

Front

How can you convert the general form of a circle's equation to standard form?

Back

You can complete the square for both x and y terms to convert to standard form.