Question

find the number of diagonals of a polygon with 8 sides ​

Answer 1

Answer:

8/360

45

180-45

135

understand

Answer 2

Number of diagonals = 20

Given:

Number of sides of a Polygon = 8 sides

To find:

Number of diagonals

Solution:

Note:

The formula for number of diagonals of a polygon with "n" number of  sides is given by Number of diagonals = n(n-3) / 2

From given data n = 8 and the polygon is Octagon

⇒ Number of diagonals = n(n-3) / 2

                                        = 8(8 - 3) /2 = 4(5) = 20

Therefore, Number of diagonals = 20

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