circumference of a 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 10 ft, what is the diameter?

Back

20 ft.

Front

What is the value of π (pi) approximately?

Back

3.14.

Front

How do you find the circumference of a circle with a known diameter?

Back

Multiply the diameter by π (Circumference = π × diameter).

Front

What is the circumference of a circle with a radius of 12.5 mm?

Back

78.5 mm.

Front

If the diameter of a circle is 3 cm, what is the circumference?

Back

9.42 cm.

Front

What is the relationship between radius and diameter?

Back

Diameter = 2 × radius.

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

What is the circumference of a circle with a radius of 5 inches?

Back

31.4 inches.

Front

If the circumference of a circle is 44 inches, what is the radius?

Back

7 inches (using the formula radius = circumference / (2 × π)).