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Assumptions and Estimation

Understanding how to interpret figures on the GMAT is crucial for avoiding traps and making accurate deductions.
  • Lines that appear straight in GMAT figures are indeed straight, which is a reliable assumption test-takers can make.
  • Assumptions about lengths, angles, parallelism, or perpendicularity based solely on appearance are unreliable and should be avoided.
  • Figures on the GMAT may not be drawn to scale, emphasizing the importance of not trusting the visual representation for making geometric deductions.
  • Reliable deductions must be based on explicit information provided in the text of the problem or within the figure itself.
  • Logical deductions based on the rules of geometry are the only trustworthy method to determine the properties of figures on the GMAT.
The Reliability of Straight Lines
The Pitfalls of Assumptions
Figures Not Drawn to Scale
Trusting Text Over Visuals
Making Logical Deductions