Step by step
The question
Question: make a circle graph of car 45%, bus 20%, bike 10%, walk 25%.
car 45%, bus 20%, bike 10%, walk 25%
A circle graph shows the parts of a whole as slices.
The whole circle is 360 degrees.
the whole circle = 360°
1 Each part of 360°
Car is 45% of the circle.
45% is 0.45.
0.45 times 360 is 162°.
= car: 45% × 360 = 0.45 × 360 = 162°
Careful!
A percent is out of 100.
Degrees are out of 360.
45% of the circle is 162°.
Careful: not 45% → 45° ✗
Bus: 20% of 360 is 72°.
= bus: 20% × 360 = 0.2 × 360 = 72°
Bike: 10% of 360 is 36°.
= bike: 10% × 360 = 0.1 × 360 = 36°
Walk: 25% of 360 is 90°.
= walk: 25% × 360 = 0.25 × 360 = 90°
2 Draw the circle graph
We draw a circle and start at the top.
Car: a slice of 162°, going round like a clock.
Then bus, 72°, and so on.
So the slices are car 162°, bus 72°, bike 36° and walk 90°.
= car 162°, bus 72°, bike 36°, walk 90°
3 Check
Let's check: the slices fill the circle: 162 plus 72 plus 36 plus 90 is 360.
So the answer is right!
162 + 72 + 36 + 90 = 360
Let's look back.
First: each part of 360°.
Then: draw the circle graph.
Last: check.
Answer
= car 162°, bus 72°, bike 36°, walk 90°