UNIQUE FRIENDS SCHOOLSQUADRILATERALS
In Basic Technology, a quadrilateral is any four-sided figure used in drawing, design, and construction. It is very important in technical drawing, building, and fabrication work.
A quadrilateral is a closed shape with:
4 sides
4 angles
4 corners (vertices)
👉 The total sum of its interior angles is:
A + B + C + D = 360°
Types of Quadrilaterals
They include:
Square
All sides are equal
All angles are 90°
Used in tiles, frames, and plates
Rectangle
Opposite sides are equal
All angles are 90°
Used in doors, windows, books
Parallelogram
Opposite sides are parallel and equal
Opposite angles are equal
Used in structural designs
Rhombus
All sides are equal
Angles are not necessarily 90°
Used in design patterns
Trapezium (Trapezoid)
One pair of opposite sides is parallel
Used in bridge supports and roofing
Kite
Two pairs of adjacent equal sides
Used in craft and design
Importance in Basic Technology
Quadrilaterals are used in:
Technical drawing (shapes and projections)
Building construction (walls, windows, doors)
Woodwork and metalwork (frames, joints)
Engineering designs
Simple Example
A classroom door is a rectangle, while a floor tile may be a square.