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It is a 42 sided polygon and has: 0.5*(422-(3*42)) = 819 diagonals

Q: How many diagonals can be drawn in a tetracontakaidigon?

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38 diagonals

5693

If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed

corn dogs

4

Related questions

9 diagonals

9 diagonals

how many triangles are formed when any parallelogram and it diagonals are drawn

An octagon has 16 diagonals.

38 diagonals

0.5*(82-24) = 20 diagonals

Four sided quadrilaterals have two diagonals.

5693

8

If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed

It is 18 diagonals

You can draw 9 diagonals inside a hexagon.