how to find the radius and circumfernce in a circle

- anonymous

how to find the radius and circumfernce in a circle

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- Nnesha

formula to find circumference \[\huge\rm C= 2 \pi r\] r =radius
if the given is diameter then you use \[C= \pi d \]
remember
radius is half of diameter \[\large\rm r=\frac{ d }{ 2 }\]

- anonymous

ive seen a problem where it just gives a circle and says find the radius..
how is that possible if it doesn't give anymore info on it?

- Nnesha

do you have example like what ?

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## More answers

- Nnesha

post the original question :=)

- anonymous

|dw:1443384439854:dw| find the radius...

- anonymous

bad circle sry lol

- Nnesha

hahha thats fine you can use the tool in draw

- Nnesha

|dw:1443384527525:dw|

- anonymous

how did you find the radius if it doesn't give any info on the circle

- anonymous

ok actually here is another problem i have str8 from the review

- Nnesha

radius is half of diameter
and diameter is straight line passing through the center of the circle

- anonymous

|dw:1443384671583:dw| find the circ and area of each circle. round to nearest 10th

- Nnesha

yes that's the diameter
a line passing through the center
now use the formula to find radius
i repeat radius is `Half` of diameter \[\huge\rm r=\frac{ d }{ 2}\]

- Nnesha

r=radius
d=diameter
so you can replace d with 8

- anonymous

its not asking for the radius its asking for the circumference and area though

- anonymous

its 18 sry sloppy

- Nnesha

oh okay
so use the formula i posted above
read my first comment

- anonymous

\[9\times \pi \times 9?\]

- anonymous

sry 2 instead of 9 at the front

- Nnesha

yes right ! \[\large\rm 2 \pi 9\]

- anonymous

mind if i give 1 more example?

- Nnesha

sure!

- Nnesha

go for it

- anonymous

oh and how do i find the area? thats also what it asks

- Nnesha

oh to find area \[\huge\rm A= \pi r^2\]

- anonymous

\[81\times \pi?\]

- Nnesha

yes right you can use pi
but if it says write answer in terms of pi
then 81pi is the answer

- anonymous

ok then 1 more question if you don't mind =D

- Nnesha

alright

- anonymous

|dw:1443385350101:dw| find circumference and area

- anonymous

so circumference is 26

- Nnesha

try it

- Nnesha

not just 26

- anonymous

sry i mean diameter

- Nnesha

remember it's \[\huge\rm C=2 \color{reD}{\pi} r \]

- anonymous

meant diameter is 26

- Nnesha

yes right diameter is 26 :=)

- anonymous

\[2 \times \pi \times 13?\]

- Nnesha

looks good

- anonymous

i think i just learned how to get the diameter, circ, and area of a circle =O

- Nnesha

good ! :=)

- anonymous

thanks for the help =D

- Nnesha

np it was my pleasure :=)
welcome to openstudy btw

- anonymous

thanks =D

- Nnesha

o^_^o

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