CBSE 9 Math · U4
Geometry
CBSE Class 9 Mathematics Unit IV: Euclid's geometry, axioms and postulates, lines and angles, triangle congruence, quadrilaterals, midpoint theorem, circle theorems, and construction-based reasoning.
Test yourself
A focused, distraction-free run through 75 multiple-choice questions. Hints if you need them; your score at the end.
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 4.1
Euclid's Geometry
History of geometry, undefined terms, axioms, postulates, and simple construction reasoning.
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Topic 4.2
Lines and Angles
Rays, angle types, intersecting lines, linear pairs, vertically opposite angles, and angles with parallel lines.
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Topic 4.3
Triangles and Congruence
Triangle rigidity, congruence, correspondence, SAS, SSS, ASA, RHS, isosceles triangles, converse statements, and triangle inequalities.
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Topic 4.4
Quadrilaterals
4-gons, parallelogram properties, midpoint theorem, central symmetry, and simple coordinate applications.
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Topic 4.5
Circles
Circle terminology, chords, diameter, distance of chords from the centre, subtended angles, angles in the same segment, semicircles, and cyclic quadrilaterals.
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