Question

what is the number of diagonals in a pentagon,heptagon,polygon of 10 sides​

Answer 1

Answer:

The number of diagonals in a polygon is n(n-3)/2. So a decagon has 10(10–3)/2 = 10*7/2 = 35 diagonals

Step-by-step explanation:

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Answer 2

Answer:

Pentagon: 35

Heptagon: 14

Polygon: 35

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