Question

calculate the circumference of a CIRCLE area is equal to the sum of of the area of the circles with the diameter 24cm,32cm and 96cm?

Answer 1

@Jhannybean

Answer 2

help?

Answer 3

@mathmath333
@M,aliha
@Mikayla_Rose

Answer 4

@hartnn

Answer 5

Hmm... for starters.\[A=\pi r^2\]\[C= 2 \pi r\]

Answer 6

\[A_T = \pi ((r_1)^2+(r_2)^2 +(r_3)^2)\]

Answer 7

\[r=\frac{D}{2}\]

Answer 8

So find all your radiuses first.

Answer 9

144 , 256, 2304?

Answer 10

so 144 + 256 + 2304
so 2704

Answer 11

@Jhannybean

Answer 12

@mathmath333

Answer 13

@M,aliha

Answer 14

@ganeshie8

Answer 15

Alright, so \(A_T = 2704\pi\)

Answer 16

now?

Answer 17

now you resolve for \(r\)\[r=\sqrt{\frac{A_T}{\pi}}\]Plug this \(r\) into the formula for circumference and find it.

Answer 18

52/7?

Answer 19

i meant sqrt 52/7

Answer 20

\[C=2\pi\sqrt{\frac{A_T}{\pi}}\]

Answer 21

ummm pi gets cancelled?

Answer 22

...

Answer 23

It wouldn't get cancelled.

Answer 24

confused

Answer 25

Oh, that \(\pi\), the one inside , yeah that would.

Answer 26

\[C= 2\pi \sqrt{\frac{2704\color{red}{\pi}}{\color{red}{\pi}}} \]

Answer 27

yeah those do. Sorry.

Answer 28

so, 2pi*52?

Answer 29

and what is \(52 \cdot 2 = \) ?

Answer 30

104

Answer 31

There you go.

Answer 32

there were 3 pi's i guess

Answer 33

Yeah, and you were left with 1.

Answer 34

so it's104cm?

Answer 35

\[C=104\pi\]

Answer 36

Don't forget the \(\pi\).

Answer 37

\[C= 2\pi \sqrt{\frac{2704\color{red}{\pi}}{\color{red}{\pi}}} = 2\pi \cdot 52 = 104\pi \approx 326.7256\]

Answer 38

one more question.

Answer 39

thx for the help

Answer 40

And no problem.

Answer 41

find the circumference of the circle whose area is 16times the area of the cirlce with diameter 1.4cm

Answer 42

circle*

Answer 43

Would you mind closing this question and posting up a new one? :)