Lesson · Grade 7 · Mathematics
Drawing a circle graph from data
- Grade 7
- Mathematics
- 1 min 21 s
- British Columbia
- BC7-MA-66
Using the favourite fruits of 20 students, the video adds up the total and turns each count into a percent (8 ÷ 20 = 0.4 = 40%), then turns each percent into an angle (0.4 × 360° = 144°), checking that the percents make 100% and the angles make 360°. It then draws the circle graph step by step: a radius straight up, then a protractor that measures each angle clockwise from the last line, and finishes with labels, a title and a one-line recap.
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In one sentence
The question this lesson answers
How can we show the favourite fruits of 20 students on a circle graph?
First, add up the numbers to get the total, which is 20.
Transcript
What the lesson says
How can we show the favourite fruits of 20 students on a circle graph?
First, add up the numbers to get the total, which is 20.
Next, write each part as a percent of the total.
For apples, 8 divided by 20 is 0.4, which is 40 percent.
Do the same for each fruit, and check that they make 100 percent.
A full circle has 360 degrees.
For apples, 40 percent of 360 degrees is 144 degrees.
The other angles are 90, 72 and 54 degrees, making 360 in all.
Now draw a circle, and a radius from the centre straight up.
Use a protractor to measure 144 degrees, then draw the next radius.
Measure each next angle from the last line you drew.
Label each sector with its name and percent, then add a title.
Find each part's percent, then take that percent of 360 degrees for its angle.
Curriculum
Where this fits
- British Columbia, Grade 7
Mathematics, Data and probability: circle graphsBC7-MA-66
Previous: From a Percent on a Circle Graph to a QuantityNext: Experimental and Theoretical Probability: Flip a Coin, Roll a Die
The outcomes and strands follow the British Columbia curriculum.
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