Circles!

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are a fixed distance from a center point.

Front

What is the center of a circle?

Back

The center of a circle is the point that is equidistant from all points on the circle.

Front

What is a radius?

Back

The radius is the distance from the center of the circle to any point on the circle.

Front

What is a diameter?

Back

The diameter is the distance across the circle through the center, equal to twice the radius.

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr.

Front

What is the formula for the area of a circle?

Back

A = πr².

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

How do you find the circumference if you know the radius?

Back

Use the formula C = 2πr.

Front

How do you find the radius if you know the diameter?

Back

Divide the diameter by 2.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.