Question

the circumference of a circle is 10 (wierd symbol) inches find is radius and area. The radius of the circle is ( ) in.

Answer 1

weird symbol?

Answer 2

looks like a cursive r

Answer 3

can you draw it?

Answer 4

Do you mean pi? As in π?

Answer 5

cursive r looks like \(\large \pi\)

Answer 6

yes

Answer 7

i feel so stupid

Answer 8

well, you should.

Answer 9

new to algebra

Answer 10

circumference = 2 pi r
area = pi r^2

where r is the radius

Answer 11

so if circumference = 10pi

10pi / 2pi = r

correct?

Answer 12

C= 2πr
10π = 2πr
To find r, isolate it.
\[\frac{10π}{2π} = \frac{2πr}{2π}\]\[\frac{5\cancel{10π}}{\cancel{2π}} = \frac{\cancel{2πr}}{\cancel{2π}}\]\[r = 5\]Now, the formula for area is \(πr^{2}\).Plug the radius into the formula and solve for the area.
\[A = πr^{2}\]\[A = π(5)^{2}\]\[A = ?\]

Answer 13

r is correct but what is the area

Answer 14

I gave yo what you need. Now just follow the formula and solve for it.

Answer 15

if you have r and area = pi r^2

what can you do?

Answer 16

this is my first week in college algebra and i have no clue what i am doing

Answer 17

college? you must be joking.

Answer 18

This is barely algebra I and more like basic arithmetic. Do you know how to square something?
\[A = πr^{2}\]\[A = π(5)^{2}\]

Answer 19

r = 5
area = pi r^2

put r into the area formula

Answer 20

times it by itself

Answer 21

Yes. THat's what we're asking you to do.

Answer 22

so 25

Answer 23

lol and if i might ask, what college do you attend?

Answer 24

Yes.
A = 25π
If you want an exact answer, this is it. If you want an approximate answer, it's A = 3.14(25).

Answer 25

university of Phoenix