Chapter 4 of 9
Concept Maps
Geometry — Concept Maps
Tamil Nadu Board · Class 9 · Mathematics
3 concept maps of Geometry for Tamil Nadu Board Class 9 Mathematics, each also written out as a text outline. Maps: Geometry Concepts Overview.
42 questions25 flashcards5 concepts
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3 Concept Maps
Geometry Concepts Overview
The map in words
- Geometry
- Angles
- Complementary
- Supplementary
- Linear Pairs
- Vertically Opposite
- Triangles
- Angle Sum 180
- Congruence Rules
- Exterior Angles
- Properties
- Quadrilaterals
- Angle Sum 360
- Parallelogram
- Rhombus
- Cyclic Quadrilateral
- Circles
- Chord Properties
- Angles at Centre
- Angles at Circumference
- Segments
- Parallel Lines
- Corresponding Angles
- Alternate Angles
- Co-interior Angles
- Angles
Geometry Chapter 4 – Complete Concept Overview
The map in words
- root((Geometry
- Class 9))
- Angles
- Complementary
- Sum is 90 degrees
- Supplementary
- Sum is 180 degrees
- Linear Pair
- Adjacent and supplementary
- Vertically Opposite
- Always equal
- Transversal
- Corresponding equal
- Alternate equal
- Co-interior 180 degrees
- Complementary
- Triangles
- Angle Sum
- Sum is 180 degrees
- Exterior Angle
- Equals two opposite interior
- Congruence
- SSS Rule
- SAS Rule
- ASA Rule
- AAS Rule
- RHS Rule
- Angle Sum
- Quadrilaterals
- Angle Sum is 360 degrees
- Parallelogram
- Opposite sides equal
- Diagonals bisect each other
- Rhombus
- All sides equal
- Diagonals perpendicular
- Rectangle
- All angles 90 degrees
- Equal diagonals
- Square
- All sides and angles equal
- Trapezium
- One pair parallel sides
- Kite
- Two pairs adjacent sides equal
- Circles
- Parts
- Radius and Diameter
- Chord and Arc
- Sector and Segment
- Chord Theorems
- Perp from centre bisects chord
- Equal chords equidistant
- Arc Theorems
- Central is double inscribed
- Semicircle angle is 90
- Same segment angles equal
- Cyclic Quadrilateral
- Opposite angles sum 180
- Exterior equals opposite interior
- Parts
- Constructions
- Centroid G
- Median intersection
- Always inside
- Orthocentre H
- Altitude intersection
- Depends on triangle type
- Circumcentre S
- Perp bisector intersection
- Centre of circumcircle
- Incentre I
- Angle bisector intersection
- Always inside
- Centroid G
- Angles
Complete Geometry Concept Map
The map in words
- GEOMETRY
- Angles and Lines
- Types of Angles
- Complementary
- Supplementary
- Adjacent
- Linear Pair
- Vertically Opposite
- Transversals
- Corresponding Angles
- Alternate Interior
- Alternate Exterior
- Co-interior
- Types of Angles
- Triangles
- Properties
- Angle Sum 180 degrees
- Exterior Angle
- Congruence
- SSS
- SAS
- ASA
- AAS
- RHS
- Centres
- Centroid
- Orthocentre
- Circumcentre
- Incentre
- Properties
- Quadrilaterals
- Types
- Parallelogram
- Rhombus
- Rectangle
- Square
- Trapezium
- Kite
- Properties
- Angle Sum 360
- Diagonal Properties
- Opposite Sides
- Types
- Circles
- Parts
- Radius
- Diameter
- Chord
- Arc
- Sector
- Segment
- Theorems
- Chord Properties
- Angle Subtended
- Inscribed Angles
- Cyclic Quadrilateral
- Opposite Angles 180
- Exterior Angle Property
- Parts
- Angles and Lines
Explore these maps interactively
Explore DiagramsFrequently Asked Questions
What are the important topics in Geometry for Tamil Nadu Board Class 9 Mathematics?
Key topics in Geometry include Types of Angles and Linear Pair, Transversals and Parallel Lines, Triangles and Angle Sum Property, Congruent Triangles. Study these first, then practise questions on each for Class 9 exams.
What do the concept maps for Geometry show?
The 3 maps show how the ideas in Geometry connect: Geometry Concepts Overview; Geometry Chapter 4 – Complete Concept Overview. Each map is also written out as an outline on this page.
How should I revise Geometry for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Geometry. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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