Octagon Calculator
Area
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Perimeter
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Short Diagonal
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Long Diagonal
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Understanding Octagons
An octagon is a polygon with eight sides and eight angles. A regular octagon has:
- Eight equal sides
- Eight equal angles of 135°
- Eight lines of symmetry
Key Formulas
Area: A = 2(1 + √2)a²
Perimeter: P = 8a
Short Diagonal: s = a√(2 + √2)
Long Diagonal: d = a√(4 + 2√2)