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how many internal diagonals does a decagon (ten sided polygon) have?

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how many internal diagonals does a decagon (ten sided polygon) have?  [#permalink]

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New post 27 Feb 2015, 02:18
2
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (01:08) correct 25% (01:42) wrong based on 99 sessions

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how many internal diagonals does a decagon (ten sided polygon) have?

1.90
2.85
3.70
4.35
5.25
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Re: how many internal diagonals does a decagon (ten sided polygon) have?  [#permalink]

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New post 27 Feb 2015, 02:30
2
1
Turkish wrote:
how many internal diagonals does a decagon (ten sided polygon) have?

1.90
2.85
3.70
4.35
5.25


hi,
the questions means we have to choose two vertices out of 10=10c2..
but these will also contain vertices adjoining to each other as these form sides and not diagonals..
ans=10c2-10=45-10=35
ans D..35
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Re: how many internal diagonals does a decagon (ten sided polygon) have?  [#permalink]

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New post 28 Feb 2015, 02:20
1
1
Turkish wrote:
how many internal diagonals does a decagon (ten sided polygon) have?

1.90
2.85
3.70
4.35
5.25


Number of diagonals in any polygon can be found using this formula: n(n-3)/2
Here n = 10
No. of diagonals = 10(10 - 3)/2
= 35
Hence option 4.

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Re: how many internal diagonals does a decagon (ten sided polygon) have?  [#permalink]

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New post 06 Dec 2017, 04:31
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Re: how many internal diagonals does a decagon (ten sided polygon) have? &nbs [#permalink] 06 Dec 2017, 04:31
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