Circle Measurements

Front

What is the diameter of a circle?

Back

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

Front

What is the formula to calculate the diameter from the radius?

Back

Diameter = 2 × Radius

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = 2 × π × Radius or Circumference = π × Diameter

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm

Front

If the diameter of a circle is 12 ft, what is the radius?

Back

6 ft

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 area of a circle?

Back

Area = π × Radius²

Front

What is the area of a circle with a radius of 3 cm?

Back

Approximately 28.26 cm²

Front

What is the relationship between diameter and radius?

Back

The diameter is always twice the length of the radius.