Creating a Circle Graph from Data

Introduction

• Demonstrating how to create a circle graph (pie chart) using an example.

Example Problem

• Expenses incurred by Jake (hired by the CIA):
  • Travel (plane tickets): $1,520
  • Spy Cameras: $1,260
  • Kung Fu Lessons: $975
  • Bulletproof Vest: $700
  • Pizza: $145
• Total expenses:
  • Calculation:
    • $1,520 + $1,260 + $975 + $700 + $145 = $4,600

Calculating Percentages

1. Travel:
   • Calculation: $1,520 / $4,600 = 33%
2. Spy Cameras:
   • Calculation: $1,260 / $4,600 = 27%
3. Kung Fu Lessons:
   • Calculation: $975 / $4,600 = 21%
4. Bulletproof Vest:
   • Calculation: $700 / $4,600 = 15%
5. Pizza:
   • Calculation: $145 / $4,600 = 3%

• Total Percentages:
  • Should add up to 100% (actual: 99% due to rounding).

Calculating Degrees for Circle

• Total Degrees in Circle: 360°

1. Travel (33%):
   • Calculation: 33% of 360 = 119°
2. Spy Cameras (27%):
   • Calculation: 27% of 360 = 97°
3. Kung Fu Lessons (21%):
   • Calculation: 21% of 360 = 76°
4. Bulletproof Vest (15%):
   • Calculation: 15% of 360 = 54°
5. Pizza (3%):
   • Calculation: 3% of 360 = 11°

• Total Degrees: Should add up to 360° (actual: 357° due to rounding errors).

Drawing the Circle Graph

1. Draw a horizontal line for reference.
2. Measure angles using a protractor for accuracy:
   • Travel: 119° (Label: Travel, 33%)
   • Spy Cameras: 97° (Label: Cameras, 27%)
   • Kung Fu Lessons: 76° (Label: Kung Fu, 21%)
   • Bulletproof Vest: 54° (Label: Bulletproof Vest, 15%)
   • Pizza: 11° (Label outside circle: Pizza, 3%)
3. Alternatively, use a spreadsheet for automatic circle graph generation with colors and keys.

Conclusion

• A step-by-step method for creating a circle graph using numerical data through calculation and accurate drawing.