Chapter 11 of 19
Revision Notes
Geometry and Mensuration — Revision Notes
CAT · Quantitative Aptitude
Free Geometry and Mensuration revision notes for CAT Quantitative Aptitude 2026 — key concepts, formulas, and definitions for quick revision.
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Get startedRevision Notes — Geometry and Mensuration
Key concepts, formulas, and definitions from Geometry and Mensuration for CAT Quantitative Aptitude preparation.
Key Topics to Revise
1
Basic Angles and Properties
- Acute angle: Less than 90°; Right angle: Exactly 90°; Obtuse angle: 90° to 180°
- Complementary angles: Two angles that add up to 90°
- Supplementary angles: Two angles that add up to 180°
2
Polygons and Their Properties
- Sum of interior angles of n-sided polygon = (n-2) × 180°
- Sum of exterior angles of any polygon = 360°
- For regular polygons: Each interior angle = (n-2) × 180°/n
3
Triangles - Types and Properties
- Sum of angles in any triangle = 180°
- Triangle inequality: Sum of any two sides > third side
- Exterior angle = sum of two non-adjacent interior angles
4
Quadrilaterals and Special Cases
- Sum of all angles in quadrilateral = 360°
- Parallelogram: opposite sides parallel and equal, diagonals bisect each other
- Rectangle: parallelogram with all angles 90°, diagonals are equal
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Key Concepts
Seven main typesTriangles are classified by angles (acuteCongruent triangles have equal corresponding sidesEquilateral triangle (side a)Four
Frequently Asked Questions
What topics are covered in Geometry and Mensuration for CAT?
Geometry and Mensuration is an important chapter in CAT Quantitative Aptitude. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Basic Angles and Properties, Polygons and Their Properties, Triangles - Types and Properties, Quadrilaterals and Special Cases.
How important is Geometry and Mensuration for CAT?
Geometry and Mensuration is a frequently tested chapter in CAT Quantitative Aptitude. Questions from this chapter appear regularly in previous year papers. There are 69 practice questions available for this chapter.
How to prepare Geometry and Mensuration for CAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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