Calculate Diagonals in Area and Space

Calculator for the diagonals in a rectangular area and in a cuboid-shaped space. A diagonal is a line between two opposite corners. Its length in two and in three dimensions can be calculated here. For a diagonal in an area, enter two values, for one in a space, enter three values.

The formula is d = √ a² + b² + c²

Distance length:
Distance width:
Distance depth:
Length diagonal:

Round to    decimal places.

Diagonals area and space

Area diagonal (red) and space diagonal (blue). The space is spanned by a cuboid, whose faces are rectangles.

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