what is the number of diagonals in a polygon of 12 sides and 20 sides
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2
Answer:
54 sides as ×- y = 54 because their are 12 and 20 sides
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8
Answer:
A closed polygon with 12 sides will have 12 vertices.
A diagonal requires two vertices.
=> C(12,2)= 12!/2! 10!= 66 lines can be drawn using any 2 points.
- But 12 lines form the sides of the polygon.
A closed polygon with 20 sides will have 20 vertices.
A diagonal requires two vertices.
=> C(20,2)= 20!/2! 10!= 190 lines can be drawn using any 2 points.
- But 20 lines form the sides of the polygon.
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