Informal Proof: Circumference of a Circle
Find the circumference using the formula.
What is the circumference of a circle with a radius of 1 cm?
What is the circumference of a circle that has a radius of 10 in?
Compare to the perimeter of a regular polygon inscribed in a circle.
Circumference vs. Perimeter of Inscribed Regular N-gon
Move the slider and compare the actual circumference to the perimeter of the polygon. Explain what happens as you increase the number of sides on the polygon.
Do you think that the perimeter of the inscribed regular n-gon is a good estimate for the circumference of the circle? Why or why not?