# Thread: One more quick question

1. ## One more quick question

The circumference of a circle varies directly as the diameter. A circular pizza pie with a diameter of 1 foot has a circumference of 3.14 feet. What will be the circumference of a pizza pie with a diameter of 1.5 feet?
Thank you all for the help i really appreciate it.

2. Originally Posted by Ravangerz
The circumference of a circle varies directly as the diameter. A circular pizza pie with a diameter of 1 foot has a circumference of 3.14 feet. What will be the circumference of a pizza pie with a diameter of 1.5 feet?
Thank you all for the help i really appreciate it.
As you stated the proportion of diameter and radius of circles is a constant: $\pi$. (Even though the question refers to pizze this constant number is definitely not pie but pi )

Now use the proportion:

$\dfrac{3.14'}{1'} = \dfrac c{1.5'}$

Solve for c (= circumference)