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PostPosted: Wed Dec 27, 2017 9:14 am 
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Joined: Wed Jan 13, 2016 11:13 am
Posts: 33
How many vertices does a 3D L shape have?


My dd said the answer is 10. Is she correct? Or is the answer 12? Do we not count the 'inward' going corners as vertices?

How about corners in 2 D shapes? Do the 'inward' going corners count as corners or not?

Thanks very much for your help.


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PostPosted: Wed Dec 27, 2017 9:58 am 
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Joined: Mon Feb 12, 2007 1:21 pm
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A vertex is a point where edges or faces meet, so yes concave 'points' are vertices.


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PostPosted: Thu Dec 28, 2017 7:41 am 
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Joined: Wed Jan 13, 2016 11:13 am
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Thank you. My dd said at school the teacher told them the inward going 'corners' don't count as corners!!!! I wonder if they taught them wrong or it's her memory playing tricks, buts she says she is sure the teacher said so... :?


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PostPosted: Thu Dec 28, 2017 9:49 am 
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Joined: Mon May 16, 2011 1:05 pm
Posts: 5306
Location: Reading
Is this a primary school teacher?

I had to correct the maths ‘knowledge’ taught by a couple of DDs primary school teachers in the past.


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