Tuesday, April 19, 2011

How to find circumference and area

To find circumference starting with the radius then diameter you have to know these math equations

c=2(pi)r d=2r if the radius is 4 cm what is the circumference?

i will show what i know

r=4 so you times raduis by 2 and it will look like this (4)r X 2=8 the answer is the diameter so now you should know this pi is 3.14 when you are finding the radius you need to multiply it by pi so it will look like
(you need a calculator) 8 X 3.14= 25.1 the real answer is 25.12 but i used the up to tenths

To find circumference starting with the diameter you need to know just one math equation
c=(pi)d
for this you also need a calculator if the diameter is 12 what is the circumference?

To find this you just divide the diameter by pi<======= so it looks like this 12 \ 3.14=3.8

Again I use only the tenths place value

To find area using diameter

to find the area of the circle you basically multiply the diameter by 3 so if the diameter is 8 thern you multiply it by 3 it equals 24

and thats all I know

7 comments:

paige817 said...

God Job Jomel! The only thing you can do to make it better is to add more details to it. Like pictures and colour. Otherwise you did a great job!

Hannah said...

Good job Jomel but i think that you should have added color to your words to make things stand out
and maybe include a picture.but over all you did a good job :)

kyanna 718 said...

Good job Jomel ! : )it helped me alot

Charisse817 said...

Good job Jomel! You put everything we did that day and explained it very well! This will help me when it comes to the exams!

Joy873 said...

Good job Jomel it helped me

kim873 said...

Great job jomel! You got down all the information and it was clear to read. Maybe add pictures next time but keep it up! :)

Paolob said...

Good job jomel!!...your post was really good....a suggestion for you is to add a picture or a video....But anyways it was good