can any1 tell me how to work out the fraction of the circle to represent a number i.e. 30 people?

Question

sorry didn't know wot catagory to put it in

Answer 1

First draw a circle w/ the centerpoint well defined (e.g. use a compass). Then use a protractor, with the circle center at your protractor center, to create the angle you want.

If you want to divide the circle equally for 30 people, then you take 360 degree/30. Then you need 30 angles of 12 degrees. Create these w/ your protractor and extend to the circumference of the circle.

Keep in mind, that spreadsheet programs like excel will let you form pie-charts, which are basically this same thing only done much easier.

Answer 2

ok, if you are making a pie chart, which is what it sounds like, you have to figure a few things before you go to drawing it.

First, find what percentage fo the whole that 30 people respresents.
Ex. if there are 100 people total then that is 30%

Then multiply 360 (number of degrees in a circle) times the percentage you found after converting the percentage to a decimal by moving the decimal point 2 spaces to the left.
Ex. 360 x .3 = 108

Then measure that number in degrees on the circle. Draw one line horizontal and then measure out the degree measurement.
Ex. in our hypothetical problem it would be 108 degrees.

Draw the ending line at the degree measurement and you have the proper size piece of the circle to represent the number you had.

Answer 3

Circles work better for percents rather than exact numbers.
You need to somehow indicate what a complete circle represents (100 people, 1000 people, whatever...) then divide 30 by that number and multiply the result by 360 to get the number of degrees which will represent 30 people.

Answer 4

any circle contains 360 degrees. divide 30 into 360 ...you get 12. So 12 degrees of arc for each person. Use a protractor to make your pie chart and to measure the degrees.