Step-by-step explanation:
As decagon have 10 sides,
So, Number of diagonals = 10(10-3)/2
= 5×7
= 35 .
Note:-
If n is the number of sides any polygon, then
Number of diagonals = n(n-3)/2
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Answers & Comments
Step-by-step explanation:
As decagon have 10 sides,
So, Number of diagonals = 10(10-3)/2
= 5×7
= 35 .
Note:-
If n is the number of sides any polygon, then
Number of diagonals = n(n-3)/2