Circles

Front

What is the radius of a circle?

Back

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

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

If the radius of a circle is 12 cm, what is the circumference?

Back

24π cm.

Front

What is the area of a circle?

Back

Area = πr², where r is the radius.

Front

If the radius of a circle is 5 meters, what is the area?

Back

25π square meters.

Front

What is the diameter of a circle?

Back

The diameter is twice the radius.

Front

If the radius is 6 cm, what is the diameter?

Back

12 cm.

Front

What is the value of pi (π)?

Back

Pi is approximately 3.14 and represents the ratio of the circumference to the diameter of a circle.

Front

What is the relationship between circumference and diameter?

Back

The circumference is π times the diameter.

Front

How do you convert circumference to diameter?

Back

Diameter = Circumference / π.