anonymous
  • anonymous
how to find the radius and circumfernce in a circle
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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Nnesha
  • 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
  • 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
  • Nnesha
do you have example like what ?

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Nnesha
  • Nnesha
post the original question :=)
anonymous
  • anonymous
|dw:1443384439854:dw| find the radius...
anonymous
  • anonymous
bad circle sry lol
Nnesha
  • Nnesha
hahha thats fine you can use the tool in draw
Nnesha
  • Nnesha
|dw:1443384527525:dw|
anonymous
  • anonymous
how did you find the radius if it doesn't give any info on the circle
anonymous
  • anonymous
ok actually here is another problem i have str8 from the review
Nnesha
  • Nnesha
radius is half of diameter and diameter is straight line passing through the center of the circle
anonymous
  • anonymous
|dw:1443384671583:dw| find the circ and area of each circle. round to nearest 10th
Nnesha
  • 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
  • Nnesha
r=radius d=diameter so you can replace d with 8
anonymous
  • anonymous
its not asking for the radius its asking for the circumference and area though
anonymous
  • anonymous
its 18 sry sloppy
Nnesha
  • Nnesha
oh okay so use the formula i posted above read my first comment
anonymous
  • anonymous
\[9\times \pi \times 9?\]
anonymous
  • anonymous
sry 2 instead of 9 at the front
Nnesha
  • Nnesha
yes right ! \[\large\rm 2 \pi 9\]
anonymous
  • anonymous
mind if i give 1 more example?
Nnesha
  • Nnesha
sure!
Nnesha
  • Nnesha
go for it
anonymous
  • anonymous
oh and how do i find the area? thats also what it asks
Nnesha
  • Nnesha
oh to find area \[\huge\rm A= \pi r^2\]
anonymous
  • anonymous
\[81\times \pi?\]
Nnesha
  • Nnesha
yes right you can use pi but if it says write answer in terms of pi then 81pi is the answer
anonymous
  • anonymous
ok then 1 more question if you don't mind =D
Nnesha
  • Nnesha
alright
anonymous
  • anonymous
|dw:1443385350101:dw| find circumference and area
anonymous
  • anonymous
so circumference is 26
Nnesha
  • Nnesha
try it
Nnesha
  • Nnesha
not just 26
anonymous
  • anonymous
sry i mean diameter
Nnesha
  • Nnesha
remember it's \[\huge\rm C=2 \color{reD}{\pi} r \]
anonymous
  • anonymous
meant diameter is 26
Nnesha
  • Nnesha
yes right diameter is 26 :=)
anonymous
  • anonymous
\[2 \times \pi \times 13?\]
Nnesha
  • Nnesha
looks good
anonymous
  • anonymous
i think i just learned how to get the diameter, circ, and area of a circle =O
Nnesha
  • Nnesha
good ! :=)
anonymous
  • anonymous
thanks for the help =D
Nnesha
  • Nnesha
np it was my pleasure :=) welcome to openstudy btw
anonymous
  • anonymous
thanks =D
Nnesha
  • Nnesha
o^_^o

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