**Assumptions and Estimation**

**Next Lesson**

Summary

Understanding how to interpret figures on the GMAT is crucial for avoiding traps and making accurate deductions based on geometric reasoning rather than assumptions or appearances.

- Lines that appear straight in GMAT figures can be trusted as straight, but most other visual cues cannot be assumed to be accurate.
- Assumptions about equal lengths, horizontal or vertical lines, parallel or perpendicular lines, and right angles cannot be made without explicit information in the problem text.
- Diagrams on the GMAT are not necessarily drawn to scale, emphasizing the importance of relying on provided information and geometric reasoning over visual estimation.
- Logical deductions based on the rules of geometry and information explicitly given in the problem text or figures are reliable and should be used to navigate GMAT questions.
- The GMAT may present misleading figures to test takers, highlighting the importance of skepticism towards the appearance of figures and focusing on facts and logical deductions.

Chapters

00:00

The Reliability of Straight Lines

00:59

The Pitfalls of Assumptions in Geometry

02:33

Figures Not Drawn to Scale

04:47

Trusting Logical Deductions Over Appearances

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