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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: polygon has n sides wiyh 275 diagonals then n=?
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[Post New]7 May 2008 22:09:38 IST
    Subject: polygon has n sides wiyh 275 diagonals then n=?
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ravind111 (0)

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polygon has n sides wiyh 275 diagonals then n=?
    
[Post New]7 May 2008 22:16:36 IST
    Subject: polygon has n sides wiyh 275 diagonals then n=?
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pink_ele (1235)

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no of daigonals =nC2-n
275=n(n-3)/2
550=n(n-3)
22 x25=n(n-3)
this gives n=22
fyn !
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[Post New]7 May 2008 22:17:08 IST
    Subject: Re:polygon has n sides wiyh 275 diagonals then n=?
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arpan1 (665)

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ans is 25
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[Post New]7 May 2008 22:18:44 IST
    Subject: Re:polygon has n sides wiyh 275 diagonals then n=?
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arpan1 (665)

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pink element ur concept is right , but a calculation mistake


 


n= 25 or n= -22


since n=-22 is not possible, n= 25 is the ans


 


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[Post New]7 May 2008 22:33:22 IST
    Subject: polygon has n sides wiyh 275 diagonals then n=?
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pink_ele (1235)

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m sry
yeah i din see
its n=25 n n-3=22
sry
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even a stopped clock is right twice a day
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