Circles

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

What is the formula for finding the circumference of a circle?

Back

C = π·d (where d is the diameter).

Front

If the radius of a circle is 9 meters, what is the circumference?

Back

56.52 meters.

Front

What is the radius of a circle?

Back

The distance from the center of the circle to any point on its edge.

Front

What does 'diameter' mean?

Back

The distance across a circle through its center, equal to twice the radius.

Front

If the diameter of a circle is 14 cm, what is the radius?

Back

7 cm.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius.

Front

What is π (pi)?

Back

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

Front

How do you calculate the area of a circle?

Back

A = π·r² (where r is the radius).

Front

What is the formula for finding the area of a circle?

Back

A = π·r².