Question

How many diagonals are there in a optagon,Pentagon, Hexagon​

Answer 1

Answer:

hexagon has 9 diagonals, octagon has 20 diagonals , pentagon has5 diagonals

Step-by-step explanation:

formula for no. of diagonals:-

$\frac{number \: of \: sides (number \: of \: sides - 3)}{2}$

Answer 2

Answer:

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Octagon = 20 diagonals

Pentagon = 5 diagonal

Hexagon = 9 diagonal

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Octagon= an octagon has 8(8−3)/2 = 8×5/2 = 20 diagonals.

Pentagon= Beware of counting a diagonal more than once.

Beware of counting a diagonal more than once.For example, a pentagon (5 sides) has only 5 diagonals. Each vertex has two diagonals, so if you counted each diagonal from every vertex twice, you might think there were 10 diagonals.

Hexagon = A hexagon has 9 diagonals. A diagonal of a polygon is a line segment that runs from one vertex of the polygon to another vertex, excluding the sides...