PLEASSE HELP. I will award medal! I really dont understand this...

Question

anonymous · Answer

Do you know the formulas for circumference and area of a circle?

anonymous · Answer

Here's a simplification of the formulas:$$Area = \pi r^{2} = \pi \frac{d^{2}}{2^{2}} = \frac{\pi d^{2}}{4}$$

anonymous · Answer

Oh, and circumference:$$Circumference = \pi r = \pi \frac{d}{2} = \frac{\pi d}{2}$$

anonymous · Answer

Okay so I do i do that? Plug in 3.14 for tt and 14 for d?

anonymous · Answer

It's not called tt, it's called "pi", and you don't want to actually plug in a value for it. You just leave it represented as pi.

Everyone knows the value of pi (3.1415...), so rather than messing with all of the decimal digits, we just say you have x many pi's. Like "I have two pi's"

So in this case, you would plug in 14 for d and solve

anonymous · Answer

I got D, am I correct?

anonymous · Answer

@alexray19