Rectilinear Figures
ICSE · Class 9 · Mathematics
Quick revision notes for Rectilinear Figures — ICSE Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Introduction to Rectilinear Figures and Polygons
- Rectilinear means along a straight line or forming a straight line
- A rectilinear figure is a plane figure bounded by straight lines
- A polygon is a closed plane figure bounded by at least three line segments
Regular Polygons
- Regular polygon has all sides equal and all angles equal
- Each interior angle and each exterior angle are equal in a regular polygon
- Greater the number of sides, larger the interior angle and smaller the exterior angle
Quadrilaterals - Basic Properties
- Quadrilateral is a closed figure with four sides and four vertices
- Has two diagonals connecting opposite vertices
- Sum of all interior angles is always 360°
Trapezium
- One pair of opposite sides is parallel, other pair is non-parallel
- Isosceles trapezium has non-parallel sides equal
- In isosceles trapezium: base angles are equal, diagonals are equal
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