Question

Q3.Draw an octagon and draw the diagonals . Count and verify the number of diagonals it has.
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give ans with drawing​

Answer 1

d=n(n-3)/2
n = 8
8(8-3)/2
= 8*(5)/2
= 40/2
= 20
Octagon has 20 diagonals.
Hope it helps.
Thank you
Figure attached.