Q: How many straight diagonals does an octagon have?

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An octagon has 16 diagonals.

4 diagonals

None, if it is an irregular octagon.

8

0.5*(82-24) = 20 diagonals

Related questions

An octagon has 16 diagonals.

There are 20 diagonals

8 diagonals

4 diagonals

None, if it is an irregular octagon.

20

20

there are 5, 6, or 7 diagonals in a pentagon

Sides: 8 Diagonals : 20

8

0.5*(82-24) = 20 diagonals

A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.