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Five 5-cent coins touching each other

Touching MatchsticksSmallest number of matchsticks for a 3D structure with 6 matchsticks at each vertexFive Angles in a StarTouching coins flat on a tableA chess board and a coin!Covering Table with CoinsThe Four Coins PuzzleArrange six cigarettes in such a way that each cigarette touches every other cigaretteHow many times does the coin turn around?Where are the extra coins?

1

$begingroup$

Is it possible to position five 5-cent coins so that each coin touches the other four coins?

geometry

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asked 10 hours ago

ThomasLThomasL

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  Is it actually possible to do with $6$ coins?
  $endgroup$
  – athin
  26 mins ago
  

  
  
  
  

add a comment | 

1

$begingroup$

Is it possible to position five 5-cent coins so that each coin touches the other four coins?

geometry

share|improve this question

asked 10 hours ago

ThomasLThomasL

23611 silver badge88 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Is it actually possible to do with $6$ coins?
  $endgroup$
  – athin
  26 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

Is it possible to position five 5-cent coins so that each coin touches the other four coins?

geometry

share|improve this question

asked 10 hours ago

ThomasLThomasL

23611 silver badge88 bronze badges

$endgroup$

share|improve this question

asked 10 hours ago

ThomasLThomasL

23611 silver badge88 bronze badges

share|improve this question

asked 10 hours ago

ThomasLThomasL

23611 silver badge88 bronze badges

asked 10 hours ago

ThomasLThomasL

23611 silver badge88 bronze badges

asked 10 hours ago

ThomasLThomasL

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2 Answers
2

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3

$begingroup$

It's an old puzzle...The solution can be found here:

https://www.google.com/amp/s/richardwiseman.wordpress.com/2013/06/24/answer-to-the-friday-puzzle-211/amp/

Explanation:

Place one coin on the ground, then put 2 more on it, so that they are meeting in the middle. The other 2 coins must then be placed in the nascent slots, like a rooftop

share|improve this answer

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yeah... I remember it from somewhere, but you have a different answer than me. I answered it two minutes before you. +1 :)
  $endgroup$
  – Duck
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  very good answers, but I think there is still a missing part. As mentioned in the article it depends on the diameter and size of the coins. I think it can be done with 5 Cent Euro coins but not with 5 Cent US coins. The problem is the touching in the nascent slots. Im happy to get further comments for that.
  $endgroup$
  – ThomasL
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ThomasL Edited my answer and made sure it works.
  $endgroup$
  – Duck
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The nickel on the ground is harder for the three on top to touch, and it seems like it is impossible to touch from a mathematical standpoint, but if you do it on a not hard surface like carpet, it should work.
  $endgroup$
  – Duck
  6 hours ago
  

  
  
  
  

add a comment | 

2

$begingroup$

I think I have it:

Stack two of the coins and with the rest 3 make a pyramid and place it on the two others and make sure that the pyramid coins touch both of the 2 stacked coins.
Here is a photo of it The photo is not completely accurate, as it uses pennies and quarters and the pyramid of coins doesn't touch the first coin on the ground. Edit: just tried with real nickels and tape, works, but is a little hard to tape :)

share|improve this answer

edited 6 hours ago

answered 10 hours ago

DuckDuck

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$endgroup$

add a comment | 

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3

$begingroup$

It's an old puzzle...The solution can be found here:

https://www.google.com/amp/s/richardwiseman.wordpress.com/2013/06/24/answer-to-the-friday-puzzle-211/amp/

Explanation:

Place one coin on the ground, then put 2 more on it, so that they are meeting in the middle. The other 2 coins must then be placed in the nascent slots, like a rooftop

share|improve this answer

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yeah... I remember it from somewhere, but you have a different answer than me. I answered it two minutes before you. +1 :)
  $endgroup$
  – Duck
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  very good answers, but I think there is still a missing part. As mentioned in the article it depends on the diameter and size of the coins. I think it can be done with 5 Cent Euro coins but not with 5 Cent US coins. The problem is the touching in the nascent slots. Im happy to get further comments for that.
  $endgroup$
  – ThomasL
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ThomasL Edited my answer and made sure it works.
  $endgroup$
  – Duck
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The nickel on the ground is harder for the three on top to touch, and it seems like it is impossible to touch from a mathematical standpoint, but if you do it on a not hard surface like carpet, it should work.
  $endgroup$
  – Duck
  6 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

It's an old puzzle...The solution can be found here:

https://www.google.com/amp/s/richardwiseman.wordpress.com/2013/06/24/answer-to-the-friday-puzzle-211/amp/

Explanation:

Place one coin on the ground, then put 2 more on it, so that they are meeting in the middle. The other 2 coins must then be placed in the nascent slots, like a rooftop

share|improve this answer

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yeah... I remember it from somewhere, but you have a different answer than me. I answered it two minutes before you. +1 :)
  $endgroup$
  – Duck
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  very good answers, but I think there is still a missing part. As mentioned in the article it depends on the diameter and size of the coins. I think it can be done with 5 Cent Euro coins but not with 5 Cent US coins. The problem is the touching in the nascent slots. Im happy to get further comments for that.
  $endgroup$
  – ThomasL
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ThomasL Edited my answer and made sure it works.
  $endgroup$
  – Duck
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The nickel on the ground is harder for the three on top to touch, and it seems like it is impossible to touch from a mathematical standpoint, but if you do it on a not hard surface like carpet, it should work.
  $endgroup$
  – Duck
  6 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

It's an old puzzle...The solution can be found here:

https://www.google.com/amp/s/richardwiseman.wordpress.com/2013/06/24/answer-to-the-friday-puzzle-211/amp/

Explanation:

Place one coin on the ground, then put 2 more on it, so that they are meeting in the middle. The other 2 coins must then be placed in the nascent slots, like a rooftop

share|improve this answer

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

$endgroup$

share|improve this answer

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

answered 10 hours ago

MattiMatti

1,01411 silver badge2121 bronze badges

2

$begingroup$

I think I have it:

Stack two of the coins and with the rest 3 make a pyramid and place it on the two others and make sure that the pyramid coins touch both of the 2 stacked coins.
Here is a photo of it The photo is not completely accurate, as it uses pennies and quarters and the pyramid of coins doesn't touch the first coin on the ground. Edit: just tried with real nickels and tape, works, but is a little hard to tape :)

share|improve this answer

edited 6 hours ago

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges

$endgroup$

add a comment | 

2

$begingroup$

I think I have it:

Stack two of the coins and with the rest 3 make a pyramid and place it on the two others and make sure that the pyramid coins touch both of the 2 stacked coins.
Here is a photo of it The photo is not completely accurate, as it uses pennies and quarters and the pyramid of coins doesn't touch the first coin on the ground. Edit: just tried with real nickels and tape, works, but is a little hard to tape :)

share|improve this answer

edited 6 hours ago

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges

$endgroup$

add a comment | 

$begingroup$

I think I have it:

Stack two of the coins and with the rest 3 make a pyramid and place it on the two others and make sure that the pyramid coins touch both of the 2 stacked coins.
Here is a photo of it The photo is not completely accurate, as it uses pennies and quarters and the pyramid of coins doesn't touch the first coin on the ground. Edit: just tried with real nickels and tape, works, but is a little hard to tape :)

share|improve this answer

edited 6 hours ago

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges

$endgroup$

share|improve this answer

edited 6 hours ago

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges

answered 10 hours ago

DuckDuck

1,73511 silver badge1717 bronze badges