Circle graph: A 15, B 21, C 9, D 27

Step by step

The question

Question: make a circle graph of A 15, B 21, C 9, D 27.

A circle graph shows the parts of a whole as slices.

The whole circle is 360 degrees.

1 Find the total

First the whole: 15 plus 21 plus 9 plus 27 is 72.

2 Each part of 360°

A: 15 out of 72, that is 5/24.

Of 360 degrees: 75°.

B: 21 out of 72, of 360, is 105°.

C: 9 out of 72, of 360, is 45°.

D: 27 out of 72, of 360, is 135°.

Careful!

The parts are counts, not percents.

Each one is out of the total, 72.

3 Draw the circle graph

We draw a circle and start at the top.

A: a slice of 75°, going round like a clock.

Then B, 105°, and so on.

So the slices are A 75°, B 105°, C 45° and D 135°.

4 Check

Let's check: the slices fill the circle: 75 plus 105 plus 45 plus 135 is 360.

So the answer is right!

Let's look back.

First: find the total.

Then: each part of 360°.

Then: draw the circle graph.

Last: check.