Q1
What are rectilinear figures?
AShapes with straight sides
BShapes with curved sides
COnly circles
DOnly triangles
ICSEClass 9 (ICSE)MathematicsCh 14 · Topic 1
Rectilinear Figures (Quadrilaterals)
Rectilinear figures are shapes with straight sides, including quadrilaterals like parallelograms, rectangles, and rhombuses, each with speci
Core concept
A parallelogram has opposite sides parallel and equal, opposite angles equal, and diagonals that bisect each other.
How it works
A rectangle is a parallelogram with all angles equal to 90°, while a rhombus is a parallelogram with all sides equal.
Why it matters
The sum of interior angles in any quadrilateral is always 360°, a fundamental property used to solve related problems.
Key detail
Understanding quadrilateral properties helps us identify, classify, and prove geometric relationships involving these shapes.
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• A parallelogram has parallel, equal opposite sides.
• Opposite angles are equal.
• Diagonals bisect each other.
• A rectangle has all angles 90°.
• A rhombus has all sides equal.
• Quadrilateral interior angles sum to 360°.
• This helps solve related problems.
• These properties aid shape identification and proofs.