SOLUTION: For the circumfrence of a circle to be at least 22pi cm, what can the radius r be?

Question 554962: For the circumfrence of a circle to be at least 22pi cm, what can the radius r be?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
circumference of a circle is equal to 2*pi*r
r is the radius.
you want a circumference of at least 22*pi.
from the formula, you get:
2*pi*r >= 22*pi
divide both sides of this equation by 2*pi to get:
r >= 11
that's your answer.
you need to have a radius that's at least 11 cm long.
if your radius is 11, then your circumference is 22*pi.
if you radius is 12, then your circumference is 24*pi.
etc.

RELATED QUESTIONS
If the top of a coke can has a 7 cm diameter, what is the radius, circumfrence and area? (answered by rfer)

find the circumfrence of a circle having a radius of 16 inches. answer must be expressed... (answered by checkley77)

what is the circumfrence of a circle is the radius is .25inches , use 3.14... (answered by solver91311)

what is the formula for finding the circumfrence of a... (answered by josmiceli)

a bicycle wheel has a radius of 30. what is the circumfrence to the nearest... (answered by solver91311)

Let f be the function that determines the area of a circle (in square cm) given the... (answered by solver91311)

What is the circumference of the largest circle that can be inscribed in a semicircular... (answered by t0hierry,ikleyn)

Please help to resolve this problem. It has 3 parts. 1. A running track 4 m wide goes (answered by solver91311)

What can be an equation for a circle with the radius "square root of... (answered by Fombitz)