Why are manhole covers round? - Marc Chamberland
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Date: 2020-08-22
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Comments and reviews: 10
CryptoCoder
The reuleaux triangle NEEDS to be rotated at its center of gravity. And in the demonstration, it was rotating NOWHERE NEAR the center of gravity. Because you broke that rule, that means the demonstration is INVALID and NEEDS to be CORRECTED right NOW. And since it needs to be rotated at the center of gravity, it WON'T have a constant width, no matter what factors of the triangle you change. Don't EVER give out false information EVER again.
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The reuleaux triangle NEEDS to be rotated at its center of gravity. And in the demonstration, it was rotating NOWHERE NEAR the center of gravity. Because you broke that rule, that means the demonstration is INVALID and NEEDS to be CORRECTED right NOW. And since it needs to be rotated at the center of gravity, it WON'T have a constant width, no matter what factors of the triangle you change. Don't EVER give out false information EVER again.
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Jonni0608
They could have titled this why most covers are round. I don't even know what a manhole is. ESL + we don't have them where I live.
When I think this was used as interview questions in some companies at some point. beyond ridiculous.
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They could have titled this why most covers are round. I don't even know what a manhole is. ESL + we don't have them where I live.
When I think this was used as interview questions in some companies at some point. beyond ridiculous.
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YOUNGSHIN
Eureka. I have already known that other shape of manhole cover, such as triangle, square, and etc, could fall in, but the concept of curve of constant width. is something new to me. Thank Ted-Ed. you are my great teacher.
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Eureka. I have already known that other shape of manhole cover, such as triangle, square, and etc, could fall in, but the concept of curve of constant width. is something new to me. Thank Ted-Ed. you are my great teacher.
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chromosoze
Short answer: So the cover wouldn't fall in
Long answer: Because if you rotate a circle the distance between the bottom edge and the top edge will stay the same distance apart and they could act like a wheel.
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Short answer: So the cover wouldn't fall in
Long answer: Because if you rotate a circle the distance between the bottom edge and the top edge will stay the same distance apart and they could act like a wheel.
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Noah
Would an equilateral triangle fall in though? With other polygons you can fit an edge between two opposite vertices, but an equilateral triangle's edges are the lines between opposite vertices.
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Would an equilateral triangle fall in though? With other polygons you can fit an edge between two opposite vertices, but an equilateral triangle's edges are the lines between opposite vertices.
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Star
reuleaux tetrahedron is Not a surface of constant width, go search it
that title belongs to meissner tetrahedra which is modified from reuleaux tetrahedron
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reuleaux tetrahedron is Not a surface of constant width, go search it
that title belongs to meissner tetrahedra which is modified from reuleaux tetrahedron
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Martin
This has got ride all to do with manholes and certainly does not apply to the UK. I'm a Civil Engineer and industry standard manholes are very much square.
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This has got ride all to do with manholes and certainly does not apply to the UK. I'm a Civil Engineer and industry standard manholes are very much square.
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education
The video explained in depth WHY a shape like a circle wouldnt fall on, then showed you the practical application
And they say maths is useless
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The video explained in depth WHY a shape like a circle wouldnt fall on, then showed you the practical application
And they say maths is useless
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Greg
2: 55So convenient for an open manhole to be there in the cave man time while skateboarding in an unfortunate way. Also that looked like it hurt.
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2: 55So convenient for an open manhole to be there in the cave man time while skateboarding in an unfortunate way. Also that looked like it hurt.
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Steven
Ooookay, I came to this video to see why manhole covers are round, not to learn about basic geometry concepts.
. but Im not complaining!
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Ooookay, I came to this video to see why manhole covers are round, not to learn about basic geometry concepts.
. but Im not complaining!
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