Suppose you had a circle, with a radius of 8.0cm. How much mass would it have?

Question

anonymous · Answer

I feel like there is not enough information to complete the question, unless I'm missing something

anonymous · Answer

you're right, you need to know more, like the density of whatever the circle is made of,
is it a solid circle or a ring, does it have depth, or a cross sectional area ?

anonymous · Answer

Well we just had a physics lab in class today, and it was over mass density of a piece of cardboard. But it does not say what the density is anywhere in the lab.

anonymous · Answer

attachment

anonymous · Answer

that is the only other information it comes with

anonymous · Answer

Isn't the idea to determine the mass density of the cardboard experimentally, then you can use that information to predict the mass of the cardboard circle (assuming you remember how to calculate the area of a circle given its radius)

anonymous · Answer

The formula for the area of a circle is A = pi r^2. I can find the area of that to be 201.1 cm^2. But, now how do I find the mass of that cardboard circle?