Finding Circumference Using the Measure of Area

This video tutorial teaches how to find the circumference of a circle using its area. It begins by reviewing the formulas for area and circumference of a circle, and explains the concept of square roots, highlighting common mistakes. The tutorial provides two examples: one with an exact Pi value and another with an approximated Pi value, demonstrating how to calculate circumference in each case. By the end, viewers will understand how to derive circumference from area, even when Pi is approximated.

What is the formula for the circumference of a circle in terms of its radius?

• 2 times π times the radius

• π times the diameter

• π times the radius squared

• 2 times the radius

If the area of a circle is 16π square units, what is the radius of the circle?

• 2 units

• 4 units

• 16 units

• 8 units

How do you calculate the circumference of a circle if the radius is known?

• Multiply the radius by 2π

• Multiply the radius by π

• Divide the radius by π

• Square the radius and multiply by π

In the example where π is approximated, what is the approximate value of π used?

• 3.16

• 3.28

• 3.14

• 3.00

If the area of a circle is 28.26 square feet and π is approximated as 3.14, what is the radius of the circle?

• 4 feet

• 2 feet

• 5 feet

• 3 feet