Unit 6 Review: Circles

Front

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

Back

Front

How do you find the center of a circle given the endpoints of its diameter?

Back

Front

Back

Front

What does the term 'diameter' refer to in a circle?

Back

The diameter is the longest distance across the circle, passing through the center, and is twice the radius.

Front

If a circle has a center at (2, -1) and a radius of 3, what is its equation?

Back

Front

What is the relationship between the radius and diameter of a circle?

Back

Front

How do you determine if a point (x, y) lies inside, on, or outside a circle?

Back

Substitute (x, y) into the circle's equation. If the result is less than r^2, it's inside; equal to r^2, it's on; greater than r^2, it's outside.

Front

What is the formula for the circumference of a circle?

Back

Front

What is the area of a circle with radius r?

Back

Front

What is the significance of the center in a circle?

Back

The center is the point from which all points on the circle are equidistant.