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**jacks****Member**- Registered: 2012-11-21
- Posts: 128

If

Then isOffline

**thickhead****Member**- Registered: 2016-04-16
- Posts: 982

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

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**jacks****Member**- Registered: 2012-11-21
- Posts: 128

Yes thickhead right answer, Would you like to explain me.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

hi jacks,

Yes, I got that value to, just by calculation in Excel. But I guess you want an analysis of how to get this by algebra etc. I've been working on this, on and off, for two days and haven't got a method yet. My first attempt was to try and simplify the trig. using various trig. identities. Just went round in circles with that. Then I made a diagram with a 14 point polygon inscribed in a circle, and tried to find a method using the distances in right angled triangles plus similar triangles, angles in semi circle etc. I think that is the way to go with this, but a solution still alludes me. If I still cannot get anywhere by the end of today, I'll post my diagram. Maybe someone else can spot what I'm missing.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**thickhead****Member**- Registered: 2016-04-16
- Posts: 982

*Last edited by thickhead (2016-08-07 22:10:27)*

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

hi thickhead,

Wow! Excellent proof. I would never have thought of that. Have a gold medal:

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**thickhead****Member**- Registered: 2016-04-16
- Posts: 982

Thank you ,bob bundy.

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

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**jacks****Member**- Registered: 2012-11-21
- Posts: 128

Thanks thickhead nice solution using complex number

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