Question

What is the area of a circle with a circumference of 16π?

Answer 1

ummm not exactly

Answer 2

is it 64 PI?

Answer 3

no is the area 64 Pi? to the question I posted first.

Answer 4

You know the formula C=dπ,
you know that d= 2r so C=2rπ

Now, the C=16π so 16π=2rπ cancel the π s and devide by 2, t/f the r=4

Following so far?

Answer 5

@BubblyRena1996, are you getting this?

Answer 6

a little, math messes with me. BAD

Answer 7

Ok will go step by step, OK?

Answer 8

ok.

Answer 9

C= 16π right

Answer 10

right.

Answer 11

Do you know the regular formula for the Circumference (or C) ?

Answer 12

rPI squared? I don't think that's it.

Answer 13

Nope, that's area

Answer 14

dang it. umm then no I don't.

Answer 15

C=dπ

Answer 16

OK?

Answer 17

oooooh okay. how do I find D?

Answer 18

Do you know that d=2r ? is that correct?

Answer 19

I recall that yes.

Answer 20

Substitute 2r for d, into a regular Circumference formula.

Answer 21

(which is C=dπ)

Answer 22

but what is R like I know it's radius but that wasn't in the question? and there was no picture telling me.

Answer 23

Hold on with that...

just substitute 2r instead of d, into C=dπ

Answer 24

Can you do that?

Answer 25

so C=2RPI?

Answer 26

Good!

Answer 27

Now, you know that C=16π, so substitute 16π instead of C into C=2rπ.
Correct?

Answer 28

mhmm so 16Pi = 2rPi

Answer 29

Nice!

Answer 30

16π=2rπ correct?

What do you do now? What do you think?

Answer 31

find the radius?

Answer 32

Yep, and what od you need to do (w/ this equation) to find it?

Answer 33

What can you cancel out in 16π=2rπ?

Answer 34

no idea. and I have to go ugh. hope 64 pi is right.

Answer 35

For what? Area?

Answer 36

yes

Answer 37

Yes, but do you know how to get to it?

Answer 38

no, ill be on tomorrow to figure it out again.

Answer 39

makes sense, right?

Answer 40

yes

Answer 41

Area = π r^2

Answer 42

cause you divide by 2 its like an equation

Answer 43

Yeeeep!

Answer 44

ohhhh okay I got cha

Answer 45

glad I helped!

Answer 46

thank you :)

Answer 47

So you have no more questions about it, right?

Answer 48

correct

Answer 49

OK! Cool!