POL001 · Quadrilaterals & polygons · Classes 2–12
Square
A square has four equal sides and four right angles. Its diagonals are equal and bisect each other at 90°.
Square📐 Formula
Area = a²; Perimeter = 4a; Diagonal = a√2
✏️ Worked example
a = 5: area 25, perimeter 20, diagonal ≈ 7.07.
🌍 Where it is used
Floor tiles, chessboards and paper sheets.
❓ Quick check
A square has side 9 cm. Its area is…