**Assumptions & Estimation**

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Summary

Understanding how to effectively use estimations and assumptions in ACT geometry problems is crucial for test-takers. The ability to visually estimate measurements can significantly aid in narrowing down answer choices and confirming calculations.

- Geometry diagrams on the ACT are almost always drawn to scale, allowing for the use of visual estimation in solving problems.
- Visual estimation can help eliminate incorrect answers and serve as a confirmation for calculated answers, though it rarely solves a problem entirely on its own.
- Using the paper-based test to your advantage, such as using the corner of an answer sheet as a right angle or comparing lengths, can aid in estimation.
- Basic estimation techniques can eliminate several answer choices quickly, improving the chances of guessing the correct answer when unsure of the solution.
- Understanding the scale and possible ranges of sizes in geometric diagrams is a key strategy for the ACT.

Chapters

00:02

The Importance of Diagrams Drawn to Scale

00:55

Practical Estimation Techniques

01:19

Applying Estimation to Solve Problems

02:06

Visual Estimation in Practice