Let’s say I have a pie or cake or pizza or something like that in a round shape. I want to cut it into equal third portions.
Anyone got a good method how to go about cutting it, rather than just guessing it by eyeball?
party_pants said:
Let’s say I have a pie or cake or pizza or something like that in a round shape. I want to cut it into equal third portions.Anyone got a good method how to go about cutting it, rather than just guessing it by eyeball?
If only Donde was still around.
I could tell you how to do it with a square and a compass, but I doubt you’d really want to go through that much bother.
party_pants said:
Let’s say I have a pie or cake or pizza or something like that in a round shape. I want to cut it into equal third portions.Anyone got a good method how to go about cutting it, rather than just guessing it by eyeball?
Yes. Take a piece of paper (or a ribbon) and use it to measure the pizza diameter. Fold it in half to get the pizza radius. Two straight lines of length one radius from a point on the circumference gives 120 degrees, which is a third of a pizza.
This construction relies on the fact that the corner of an equilateral triangle is 60 degrees.
Quick and easy. Then just cut through the centre of each side of the triangle, towards the centre point of the circle.
https://www.youtube.com/watch?v=99Gubxrz7Ck
Bubblecar said:
Quick and easy. Then just cut through the centre of each side of the triangle, towards the centre point of the circle.https://www.youtube.com/watch?v=99Gubxrz7Ck
….actually you can of course just cut from the corners of the triangle :)
Bubblecar said:
Bubblecar said:
Quick and easy. Then just cut through the centre of each side of the triangle, towards the centre point of the circle.https://www.youtube.com/watch?v=99Gubxrz7Ck
….actually you can of course just cut from the corners of the triangle :)
I don’t think that would work. It requires the centre point to be known.
mollwollfumble said:
party_pants said:
Let’s say I have a pie or cake or pizza or something like that in a round shape. I want to cut it into equal third portions.Anyone got a good method how to go about cutting it, rather than just guessing it by eyeball?
Yes. Take a piece of paper (or a ribbon) and use it to measure the pizza diameter. Fold it in half to get the pizza radius. Two straight lines of length one radius from a point on the circumference gives 120 degrees, which is a third of a pizza.
This construction relies on the fact that the corner of an equilateral triangle is 60 degrees.
That sounds goodish.
CAD program. draw it fullsize, or just the centre section, to fit A4. print template.
party_pants said:
Bubblecar said:
Bubblecar said:
Quick and easy. Then just cut through the centre of each side of the triangle, towards the centre point of the circle.https://www.youtube.com/watch?v=99Gubxrz7Ck
….actually you can of course just cut from the corners of the triangle :)
I don’t think that would work. It requires the centre point to be known.
You’re going to have to know the centre in order to cut equal slices. Just measure it.
But you’ll need two circles. Easy to do if you have two cake tins the same size, two pizza bases the same size etc.
ChrispenEvan said:
CAD program. draw it fullsize, or just the centre section, to fit A4. print template.
You can do the same very quickly and easily just with Photoshop and the circular selection tool.
Bubblecar said:
You’re going to have to know the centre in order to cut equal slices. Just measure it.
Oh, you want the pizza centre point from the paper or ribbon method as well. Put the ends of the paper or ribbon on the two points of the circumference. The centre of the paper or ribbon (which you found earlier) is the centre of the pizza.
party_pants said:
Bubblecar said:
Bubblecar said:
Quick and easy. Then just cut through the centre of each side of the triangle, towards the centre point of the circle.https://www.youtube.com/watch?v=99Gubxrz7Ck
….actually you can of course just cut from the corners of the triangle :)
I don’t think that would work. It requires the centre point to be known.
That’s why you need a square, or anything of the appropriate size that is a right angle. Then use Thale’s theorum to find the centre.
Will we ever solve the problem of kids and some adults saying, your bit is bigger than my bit!
PermeateFree said:
Will we ever solve the problem of kids and some adults saying, your bit is bigger than my bit!
I count carbs as part of my diabetes management. One third of a frozen supermarket pizza is just about right quota of carbs. I can just never manage to cut it nicely into thirds.
party_pants said:
PermeateFree said:
Will we ever solve the problem of kids and some adults saying, your bit is bigger than my bit!
I count carbs as part of my diabetes management. One third of a frozen supermarket pizza is just about right quota of carbs. I can just never manage to cut it nicely into thirds.
In that case, get a school 60/30 degree set square. Place the point of the shortest length in the centre of the pizza, then flip it over to make 120 degrees, marking both angles, repeat to give the final division. (3 × 120 = 360 degrees).
PermeateFree said:
party_pants said:
PermeateFree said:
Will we ever solve the problem of kids and some adults saying, your bit is bigger than my bit!
I count carbs as part of my diabetes management. One third of a frozen supermarket pizza is just about right quota of carbs. I can just never manage to cut it nicely into thirds.
In that case, get a school 60/30 degree set square. Place the point of the shortest length in the centre of the pizza, then flip it over to make 120 degrees, marking both angles, repeat to give the final division. (3 × 120 = 360 degrees).
Upon reflection, I think the main problem I have is how to find that centre point of the circle in the first place. Once I’ve got that it is all plain sailing.
party_pants said:
PermeateFree said:
party_pants said:I count carbs as part of my diabetes management. One third of a frozen supermarket pizza is just about right quota of carbs. I can just never manage to cut it nicely into thirds.
In that case, get a school 60/30 degree set square. Place the point of the shortest length in the centre of the pizza, then flip it over to make 120 degrees, marking both angles, repeat to give the final division. (3 × 120 = 360 degrees).
Upon reflection, I think the main problem I have is how to find that centre point of the circle in the first place. Once I’ve got that it is all plain sailing.
Use a ruler or as moll suggests, just stretch a piece of paper across the pizza at its widest, cut paper to length, fold in half. Make a mark at the crease, stretch it across again, stab the pizza at the mark. There’s your centre point.
It’s not quantum astrology.
Bubblecar said:
party_pants said:
PermeateFree said:In that case, get a school 60/30 degree set square. Place the point of the shortest length in the centre of the pizza, then flip it over to make 120 degrees, marking both angles, repeat to give the final division. (3 × 120 = 360 degrees).
Upon reflection, I think the main problem I have is how to find that centre point of the circle in the first place. Once I’ve got that it is all plain sailing.
Use a ruler or as moll suggests, just stretch a piece of paper across the pizza at its widest, cut paper to length, fold in half. Make a mark at the crease, stretch it across again, stab the pizza at the mark. There’s your centre point.
It’s not quantum astrology.
Something like that. Perhaps saving the tab from the pizza box for that purpose.
party_pants said:
Bubblecar said:
party_pants said:Upon reflection, I think the main problem I have is how to find that centre point of the circle in the first place. Once I’ve got that it is all plain sailing.
Use a ruler or as moll suggests, just stretch a piece of paper across the pizza at its widest, cut paper to length, fold in half. Make a mark at the crease, stretch it across again, stab the pizza at the mark. There’s your centre point.
It’s not quantum astrology.
Something like that. Perhaps saving the tab from the pizza box for that purpose.
just order one sliced!
party_pants said:
Let’s say I have a pie or cake or pizza or something like that in a round shape. I want to cut it into equal third portions.Anyone got a good method how to go about cutting it, rather than just guessing it by eyeball?
Well sort of …
Simply cut the pizza into four equal pieces. Easy enough to do by eye. Give one piece to each of the three people.
When they’ve finished, cut the remaining slice into four pieces, etc, then keep on repeating until there is only a tiny, indivisible piece left.
Measure it’s height, divide by three and then slice horizontally.
fsm said:
Measure it’s height, divide by three and then slice horizontally.
… and make sure you get the middle slice.
The Rev Dodgson said:
fsm said:
Measure it’s height, divide by three and then slice horizontally.
… and make sure you get the middle slice.
A slice of more Pi ?
Tau.Neutrino said:
The Rev Dodgson said:
fsm said:
Measure it’s height, divide by three and then slice horizontally.
… and make sure you get the middle slice.
A slice of more Pi ?
party_pants said:
PermeateFree said:
party_pants said:I count carbs as part of my diabetes management. One third of a frozen supermarket pizza is just about right quota of carbs. I can just never manage to cut it nicely into thirds.
In that case, get a school 60/30 degree set square. Place the point of the shortest length in the centre of the pizza, then flip it over to make 120 degrees, marking both angles, repeat to give the final division. (3 × 120 = 360 degrees).
Upon reflection, I think the main problem I have is how to find that centre point of the circle in the first place. Once I’ve got that it is all plain sailing.
‘ur right, it’s all about the reflection, if ‘u can make a copy of the original circle, then folding it in half in 2 ways will give ‘u the centre where diameters intersect