Find the area of a circle with a circumference of 6 pi

2 answers:

N76 [4]3 years ago

7 0

To find the circumference of a circle you use the formula C=pi*(radius*radius). If you know that the cuircumference is 6 pi, you first plug that in to solve for the radius.
6pi=pi*(r*r)
6pi/pi=(r*r)
Square root of(6pi/pi)=r
2.45=r
Then to find the area you use the formula A=pi*(r*r) which is
A=Pi*(2.45*2.45)
A=6pi or 18.85

elena-14-01-66 [18.8K]3 years ago

3 0

The circumference formula is 2 $\pi$ r and if the circumference is 6pi then the radius is 3. apply that to the area fromula ( $\pi$ r^2 ) and you get 9 $\pi$

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Help!

Vinvika [58]

A<b+c so if b=15 and c=40 then
a<15+40
a<45

so a cant possibly be d. 50ft

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3 years ago

If n+h/5=f+9/9, then n/5=

Ann [662]

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Question
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$\boxed { \frac{n+h}{5} = \frac{f+9}{9}}$

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Split the fraction on the left
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$\boxed { \frac{n}{5} + \frac{h}{5} = \frac{f + 9}{9}}$

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Take away h/5 from both sides
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$\boxed { \frac{n}{5} = \frac{f+9}{9} - \frac{h}{5}}$

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Change the denominator to be the same
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$\boxed { \frac{n}{5} = \frac{5f+45}{45} - \frac{9h}{45}}$

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Put it into single fraction
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$\boxed { \frac{n}{5} = \frac{5f+45-9h}{45} }$

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Rearrange (This step may not be necessary)
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$\boxed {\frac{n}{5} = \frac{5f-9h+ 45}{45} }$

$\bf \Longrightarrow \ Answer \ : \boxed {\boxed {\frac{n}{5} = \frac{5f-9h+ 45}{45} }}$

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3 years ago

Simplify 4 over 7 divided by 3 over negative 8

Stolb23 [73]

-1 5/11

Step-by-step explanation:

Dividing fractions is easy as pie, flip the second one over then multiply