Eduqo
Quantitative Aptitude›Ch 5: Data & Speed Maths›Data Interpretation: Bar & Pie Charts
Master bar graphs, degree conversions, and line graphs for exam success
Always read the data labels and units carefully before calculating percentages or ratios. For pie charts, remember that 360 degrees represents the total value of 100 percent. Speed and accuracy in basic arithmetic determine your score.
Quick Memory Hooks
| Chart Type | Key Conversion | Primary Use |
|---|---|---|
| Bar Graph | Actual Values | Comparison |
| Pie Chart | 1° = Total/360 | Market Share |
| Line Graph | Trend Analysis | Growth Rate |
Bar Height
(Represents magnitude)
Represents magnitude
Taller bar means higher value.
Pie Sector
(Angle proportions)
Angle proportions
Area matches percentage share.
Line Slope
(Growth direction)
Growth direction
Upward slope shows increase.
Data Scale
(Multiplier unit)
Multiplier unit
Check if axis is in thousands.
Ignoring axis scale multipliersAlways multiply by scale factor
Exams often write 'in lakhs' at the top of the axis, and students forget to multiply.
Confusing % increase with % pointsCalculate relative percentage change
Going from 10% to 15% is a 50 percent increase, not a 5 percentage increase.
Taking wrong base value in ratiosRead denominator carefully
A is what percent of B means B is always in the denominator.
Q1.If a pie chart sector represents an angle of 72 degrees out of a total value of 5000, what is the value of that sector?
Q2.In a bar graph, Company A's revenue rose from 200 crores to 250 crores. What is the percentage increase?