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GeomBench
One page, every shape's diagonal.
A rectangle's diagonal is just the hypotenuse of the right triangle formed by its width and height — √(w² + h²) — and a square or cube diagonal is the same idea extended to equal sides (and a third dimension, for a cube).
A regular polygon with n sides has n(n−3)÷2 total diagonals connecting non-adjacent vertices, each a different length depending on how many vertices it skips — this page shows the count and the shortest one.
What you entered
Diagonal = √(w² + h²)
√(6² + 8²)= 10Result
Diagonal: 10
The diagonal measures 10 units.