Grade 9 Drawing & Interpreting Graphs Quiz draws its questions at random from 22 questions across these topics:
A few of the question types, with full solutions, so you know what to expect.
Pie charts. A survey of 60 learners is shown on a pie chart. 18 chose soccer. What angle represents soccer?
Answer: 108°
Angle = (frequency ÷ total) × 360°
= (18 ÷ 60) × 360° = 0,3 × 360°
Pie charts. The pie chart below shows how 200 learners travel to school. How many learners travel by car?
Answer: 40
Read the car slice from the chart: 72°.
Frequency = (angle ÷ 360°) × total
= (72 ÷ 360) × 200 = 0,2 × 200
Pie charts. Using the same pie chart of 200 learners, what percentage walk to school?
Answer: 40%
The walking slice is 144°.
Percentage = (144 ÷ 360) × 100%
Tip: A 144° slice is NOT 144%. Always divide by 360 first.
Pie charts. On a pie chart, the angles calculated are 108°, 90°, 72°, 54° and 36°. What must you check before drawing?
Answer: That they add up to 360°
A full circle is 360°, so every slice together must account for exactly 360°.
108 + 90 + 72 + 54 + 36 = 360 (correct)
Pie charts. 80 people were surveyed and 24 chose option A. What angle represents option A on a pie chart?
Answer: 108°
(24 ÷ 80) × 360° = 0,3 × 360°