how do you find the area of a circle with only a diameter but no radius.

Question

studygurl14 · Answer

diameter = 2 times the radius
so to find the radius if you have the diameter, divide it by 2

anonymous · Answer

I did but my answer wasn't an option.

studygurl14 · Answer

What was the problem? show us the problem and how you solved it.

anonymous · Answer

$$Radius = \frac{Diameter}{2} \implies r = \frac{d}{2}$$

anonymous · Answer

attachment

anonymous · Answer

$$Area = \pi r^2 = \pi \frac{d^2}{4} \implies Area = \frac{\pi d^2}{4}$$

anonymous · Answer

i split the diameter in half and it didn't work

studygurl14 · Answer

Area of circle = $\pi r^2$
If you have a diameter of 8, then the radius is 4. Plug in 4 for r in the formula

anonymous · Answer

@AlohaKaika

anonymous · Answer

lol if eta told me that the 24 squared equation for the area from my last question all this wouldn't happened. she just told me it was 24 squared, she never said it was an example this wouldn't have happened.

anonymous · Answer

i'll still 
medal you for the mistake though aloha.

anonymous · Answer

Wait did you find out what the answer was?

anonymous · Answer

it was 12.56 but I had to round it to the nearest unit so 12. :P

anonymous · Answer

Ohh okay :) looks like you've got it then.....