## Assumptions and Estimation

Summary

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.

Chapters

00:08

The Reliability of Straight Lines

00:59

The Pitfalls of Assumptions

02:33

Figures Not Drawn to Scale

04:29

Trusting Text Over Visuals

05:23

Making Logical Deductions

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