Area of a Circle

Front

What is the diameter of a circle?

Back

A line segment that passes through the center of the circle and whose endpoints lie on the edge/circumference of the circle.

Front

What is the radius of a circle?

Back

A line segment drawn from the center of a circle to the edge/circumference of the circle.

Front

What is the formula for the area of a circle given the radius?

Back

A = πr²

Front

What does the formula A = πr² represent?

Back

Area of a circle.

Front

What is the circumference of a circle?

Back

The distance around the circle.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (d = 2r).

Front

If the radius of a circle is 15, what is the diameter?

Back

30 (d = 2r).

Front

If the radius of a circle is 15, what is the area?

Back

A = π(15)² = 225π.

Front

What is π (pi)?

Back

A mathematical constant approximately equal to 3.14, used in calculations involving circles.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd.