Circumference

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

• 2 * π * d

• π * r^2

• 2 * r

• 2 * π * r

If the radius of a circle is 5 cm, what is its circumference? (Use π = 3.14)

• 25.4 cm

• 10.5 cm

• 31.4 cm

• 15.7 cm

What is the circumference of a circle with a diameter of 12 cm? (Use π = 3.14)

• 44.52 cm

• 37.68 cm

• 30.24 cm

• 25.36 cm

How is the circumference of a circle related to its diameter?

• The circumference of a circle is half of its diameter.

• The circumference of a circle is unrelated to its diameter.

• The circumference of a circle is equal to π times its diameter.

• The circumference of a circle is equal to its radius.

Calculate the circumference of a circle with a radius of 8 cm. (Use π = 3.14)

• 50.24 cm

• 40.24 cm

• 60.24 cm

• 45.24 cm

Explain how to find the circumference of a circle if only the radius is given.

• Circumference = 2 * π * radius

• Circumference = radius^2

• Circumference = 2 * radius

• Circumference = π * radius

If the circumference of a circle is 31.4 cm, what is its diameter? (Use π = 3.14)

• 12 cm

• 10 cm

• 15 cm

• 8 cm

What is the relationship between the circumference of a circle and its radius?

• The circumference of a circle is equal to 2 times pi times the radius (C = 2πr).

• The circumference of a circle is equal to the radius divided by pi (C = r/π).

• The circumference of a circle is equal to the radius plus pi (C = r + π).

• The circumference of a circle is equal to the radius squared (C = r^2).

Find the circumference of a circle with a diameter of 20 cm. (Use π = 3.14)

• 50 cm

• 40 cm

• 62.8 cm

• 31.4 cm

Why is the circumference of a circle important in geometry?

• The circumference of a circle is important in geometry for calculating distances around the circle.

• The circumference of a circle is important in geometry for measuring the angles within the circle.

• The circumference of a circle is important in geometry for determining the diameter of the circle.

• The circumference of a circle is important in geometry for calculating the area inside the circle.