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what is the formula of length of diagonal. For any convex polygon all the diagonals are inside the polygon but for re-entrant polygons some diagonals are outside of the polygon. You can still find the length of the diagonal by using the Pythagorean Theorem.
Diagonal of cube. Length of green diagonala2asin 900790. In the figure above click show both diagonals then drag the orange dot at any vertex of the rectangle and convince yourself this is so.
D l² w².
Diagonal of Rectangle Formula textDiagonal of Rectangle Formula sqrta2 b2 Where a is the length of the rectangle. However measuring the length of a diagonal line is trickier. Diagonal of a Rectangle l2 b2 D i a g o n a l o f a R e c t a n g l e l 2 b 2 Diagonal of a Square Formula Now lets look at a few different diagonal formulas to find the length of a diagonal. Given the side length of the square.