Statistics · JSS 3
Pie chart angle
Work out the size of each slice when drawing a pie chart.
- Angle = frequencytotal frequency × 360°
What the letters mean
- frequency
- the amount for this slice
- total frequency
- the amount for the whole pie
Worked example
15 out of 60 students walk to school. What angle is their slice?
Step 1: Fraction of the whole
1560 = 14
Step 2: Of 360°
14 × 360° = 90°
Final answer: 90°
All the angles must add up to 360°: use that to check.
See it
Play with this picture from the Pie Charts lesson.
Favourite fruit of JSS 3 students
| Item | Freq. | Anglef ÷ 36 × 360° |
|---|---|---|
| 12 | 120° | |
| 9 | 90° | |
| 6 | 60° | |
| 9 | 90° | |
| Total | 36 | 360° |
Mango: frequency12
Mango: 1236 × 360° = 120°That is ≈ 33.3% of the circle.