Finding the Circumference of a Circle Using the Diameter

The video tutorial explains how to calculate the circumference of a circle given its diameter. It begins by defining the diameter as a line passing through the center of the circle from one edge to the other. Using the formula for circumference, which is pi times the diameter, the tutorial demonstrates the calculation with pi approximated as 3.14 and a diameter of 15 centimeters. The result is a circumference of 47.1 centimeters. The video also clarifies that the circumference is the distance around the circle, akin to fencing it.

What is the diameter of a circle?

• The radius of the circle

• The area of the circle

• The distance from one edge to the other through the center

• The distance around the circle

Which formula is used to calculate the circumference of a circle?

• Circumference = 2 * pi * radius

• Circumference = pi * radius

• Circumference = pi * diameter

• Circumference = 2 * pi * diameter

If the diameter of a circle is 15 cm, what is the circumference using pi as 3.14?

• 47.1 cm

• 31.4 cm

• 94.2 cm

• 15 cm

What is the value of pi used in the calculation?

• 3.5

• 3.0

• 3.14

• 3.14159

How is the circumference of a circle best described?

• The distance around the circle

• The area of the circle

• The diameter of the circle

• The distance from the center to the edge