CBSE 9 Math · U5

Mensuration

CBSE Class 9 Mathematics Unit V: perimeter and area of plane figures, circles, arc length, sector area, Heron's formula, Brahmagupta's formula, and surface area and volume of common solids.

Test yourself

A focused, distraction-free run through 65 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 5.1

Perimeter, Area and Units

Dimensions, unit conversion, perimeter, and area of rectangles, squares, parallelograms, and triangles.

Topic 5.2

Circles, Arcs and Sectors

Circumference, area of circle, arc length, sector area, and simple applications.

Topic 5.3

Heron's Formula and Quadrilateral Area

Area from three sides, semiperimeter, and Brahmagupta's formula for cyclic quadrilaterals.

Topic 5.4

Cuboids, Cubes and Cylinders

Curved surface area, total surface area, and volume of cuboids, cubes, and cylinders.

Topic 5.5

Cones, Spheres, Hemispheres and Pyramids

Surface area and volume of cones, spheres, hemispheres, pyramids, and simple combinations.

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