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Square Calculator

Area, perimeter and diagonal of squares

Square Calculator

A = s² | P = 4s | d = s√2

A square calculator computes area (s²), perimeter (4s), diagonal (s√2), and other properties of a square with side length s. Squares are special rectangles with all sides equal and all angles 90°.

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Tip: The square is the rectangle with maximum area for a given perimeter. A square with perimeter 40 has area 100. A rectangle 5×15 with the same perimeter has area 75 — 25% less efficient.

  1. 1Area = s² (side length squared)
  2. 2Perimeter = 4s
  3. 3Diagonal = s√2 ≈ 1.414s
  4. 4Inscribed circle radius = s/2; Circumscribed circle radius = s√2/2
Side = 5=Area = 25, Perimeter = 20, Diagonal = 7.071
Area = 64=Side = 8, Perimeter = 32s = √64 = 8
PropertyFormulas = 10
Area100
Perimeter4s40
Diagonals√214.142
Inscribed circle (r)s/25
Circumscribed circle (R)s√2/27.071

Fun Fact

The square is the most efficient shape for packing — a grid of squares covers 100% of a plane without gaps. Hexagons also cover 100% but with a shorter total perimeter per unit area, which is why honeycombs use hexagons (less wax needed).

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