Intro: Equations of Circles

Front

What is the standard equation of a circle?

Back

Front

What do the variables (h, k) represent in the circle equation?

Back

The variables (h, k) represent the coordinates of the center of the circle.

Front

How do you find the radius from the circle equation?

Back

Front

Back

Front

Back

The center of the circle is (-4, 5).

Front

What does the variable r stand for in the circle equation?

Back

The variable r stands for the radius of the circle.

Front

If a circle has a center at (0, 0) and a radius of 5, what is its equation?

Back

Front

What is the equation of a circle with center (2, -3) and radius 7?

Back

Front

Back

Front

What is the distance formula used for in relation to circles?

Back

The distance formula can be used to find the distance between the center of the circle and any point on the circle, which should equal the radius.