POL002 · Quadrilaterals & polygons · Classes 2–12
Rectangle
Opposite sides are equal and all angles are 90°. The diagonals are equal.
Rectangle📐 Formula
Area = l × w; Perimeter = 2(l + w); Diagonal = √(l² + w²)
✏️ Worked example
l = 8, w = 6: area 48, perimeter 28, diagonal 10.
🌍 Where it is used
Doors, books, screens and classrooms.
❓ Quick check
Perimeter of a 7 × 3 rectangle is…