Question

formula of diagonal of pentagon and octagon and triangle​

Answer 1

Step-by-step explanation:

number of diagonals of an n-sided polygon is:

n(n − 3) / 2

Diagonals of a Regular Octagon

An octagon is any eight-sided polygon, and the sum of its angles is 1080°, as we saw above. In a regular octagon,

each angle = 1080°/8 = 135°

A triangle has zero diagonals. A diagonal connects any two non-consecutive vertices of a polygon. The problem is in a triangle all vertices are consecutive: there are no unconnected vertices.

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