Rectilinear Figures

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A rectilinear figure is a plane figure bounded by straight lines. It means 'along a straight line' or 'forming a straight line'. Example: Triangle, quadrilateral, pentagon, hexagon are all rectilinear

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Sum of interior angles = (2n - 4) right angles = (2n - 4) × 90° Where n is the number of sides. For example, in a pentagon (n=5): Sum = (2×5-4)×90° = 540°

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The sum of exterior angles of any polygon is always 4 right angles = 360°. This is true regardless of the number of sides. Each exterior angle is formed when a side is produced (extended).

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A regular polygon is a polygon with: 1. All sides equal 2. All interior angles equal 3. All exterior angles equal Key formulas: - Each interior angle = (2n-4)×90°/n - Each exterior angle = 360°/n Ex

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A parallelogram is a quadrilateral with opposite sides parallel. Key Properties: 1. Opposite sides are equal and parallel 2. Opposite angles are equal 3. Consecutive angles are supplementary (sum = 1

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A rectangle is a parallelogram with additional properties: 1. All angles are 90° (right angles) 2. Diagonals are equal in length 3. Diagonals bisect each other It has all properties of a parallelogra

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A rhombus is a parallelogram with: 1. All sides equal 2. Diagonals bisect each other at 90° 3. Diagonals bisect the vertex angles 4. Opposite angles are equal 5. Adjacent angles are supplementary Not

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A square combines ALL properties of rectangle and rhombus: 1. All sides equal (like rhombus) 2. All angles = 90° (like rectangle) 3. Diagonals are equal AND perpendicular 4. Diagonals bisect each othe