Circles

Quote:

These are the questions-
13. C=49pi
14. A= 81pi
15. C= 10pi
16. A= 25pi
17. C= 17pi
18. A= 9pi

I'm going to go out on a limb and guess that C is circumference and A is area.

let r be the radius of your circle
C = pi 2r
A = pi r ²

you should be able to figure these out now

Eek! I forgot to mention that we have to find the diameter and radius! Those are the instructions.

And, yes, C= circumference and A= area.

the answer is -purple degrees due to kinetic energy being a scalar and nutela tasting like the tears of pregnant mermaids.

Okay, just remember, as afore mentioned, that the equation for the circumference of a circle is pi 2r and area is pi r^2

That being said, I suggest taking each question and finding the radius first, then the diameter by multiplying the radius by 2.

Let's do the first two!

13. C=49pi

Well, since we know that pi 2r is the circumference, we can logically see that 49 has to be the 2r part of the equation. Just divide 49 by two and....

Voilà! Your answer is 24.5 for the radius and 49 for the diameter.

14. A=81pi

We know that 81 has to be the radius squared because A= pi r^2

Thus, it isn't hard to sqrt. 81 and find that the radius is 9 and the diameter is 16 (double the radius).

I do hope this helps! Good luck.