DI Charts: Bar, Line, Pie

Bar Charts

Reading

• X-axis: Categories
• Y-axis: Values
• Compare heights directly
• Look for patterns: Increasing, Decreasing, Constant

Calculations

• Absolute difference: Subtract values
• Percentage change: Use formula
• Ratio: Divide values

Line Graphs

Reading

• Shows trends over time
• Slope indicates rate of change
• Steep slope = Rapid change
• Flat slope = No change

Key Points

• Maximum/Minimum points
• Intersection points (if multiple lines)
• Inflection points (trend changes)

Pie Charts

Reading

• Total = 360° or 100%
• Each sector = Part of whole
• Compare sector sizes

Calculations

• Sector value = (Angle/360) × Total OR (Percentage/100) × Total
• Compare sectors: Use angles or percentages

Trick

If total not given, assume 100 or 360 for ratio questions

Mixed Charts

• Combine information from multiple charts
• Identify common variables
• Calculate step by step

CAT Strategy

• Scan all charts before answering
• Identify easy questions (direct reading)
• Use approximation for complex calculations
• Verify units (thousands, lakhs, crores)
• Time: 10-12 minutes for 4-question set