How to work out angles for a pie chart

This will give the following : . You can then convert this to an angle and draw the sector on the chart. The table below shows the grades achieved by pupils in their end-of-year exam. Pie chart showing what form of transport students take to school.

What is the most common method of travel?

What fraction of the students travel to school by car?

Now you are ready to start drawing!

Then use your protractor to measure the degrees of each sector. Then convert this to an angle and draw the sector on the chart. Calculate the angle between the two sides of each pie slice.

To do this, multiply each percentage (still in decimal form) by 360. From there, you can calculate the angle that each piece of the pie should have. Finding angles for, and drawing, pie charts.

Firstly you need to work out how big each segment is going to be. This gives you the angle of the segment. Constructing Circle Graphs or Pie Charts. First we need to know how many pupils have been asked. Now we can calculate the sector angles.

Handling angles , percentages and numbers. A whole circle contains 3degrees. If the data is not given on the pie chart you can still calculate the percentage each slice is worth or how many items of data are in each slice (if given the total amount of data).

To calculate the percentage each slice is worth, measure the angle of each slice and divide this by 3then multiply it by 100. A secondary school revision resource for GCSE Maths about foundation level data representation, pie charts and frequency diagrams. A survey was conducted to determine the number of people in cars during rush hour. The are shown in the frequency diagram below. Turn the protractor so that the zero is now on this line.

You should now be left with o. We now want to know how many angles each percentage corresponds to. To find out the number of degrees for each arc or section in the graph we multiply the . Starting with the horizontal radius, draw radii, making central angles corresponding to the . Central angle of component = Value of the component Total value × 360°.