Area and Circumference of Circles

Front

What is the formula for the circumference of a circle using the radius?

Back

Front

What is the formula for the circumference of a circle using the diameter?

Back

Front

If a circle has a radius of 4, what is its circumference in terms of pi?

Back

Front

What is the radius of a penny if its circumference is 59.66 mm?

Back

9.5 mm

Front

What is the circumference of a circle with a radius of 9 cm?

Back

Front

Define 'radius' in the context of a circle.

Back

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

Front

Define 'diameter' in the context of a circle.

Back

The diameter is twice the radius and is the distance across the circle through its center.

Front

What is the relationship between circumference and diameter?

Back

Front

How do you calculate the area of a circle?

Back

Front

What is the value of pi (π) approximately?

Back

Approximately 3.14.