Geometry & Stats
n! / r!(n−r)! for any n and r.
Last 10 computations for this calculator — click any row to restore.
No history yet — change a field above and your last 10 runs will appear here.
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Square Area & Perimeter
Area and perimeter of a square.
Rectangle Area
Area and perimeter of a rectangle.
Triangle Area
Area via ½bh or Heron's formula, plus perimeter.