My son who is 7 fetched his homework home and he had to give 10 examples of a prism and 10 examples of prism. The teacher gave him 2 examples of each with the 2 for a cylinder being a bin and a tin of beans, and the two examples for a prism being a tomblerone and a cucumber? I have looked on the internet and everything says a prism should have 3 sides, eg a tomblerone. So how come a cucumber is a prism? i have phoned other parents who have kids in the same class and they have all being given the same. CONFUSED???!!!!
2006-12-03 08:44:11 · 11 answers · asked by 2plus3 3 in Science & Mathematics ➔ Mathematics
Thanks to everyone who answered so far, i think i need another way to explain this to him as he is only 7.
2006-12-03 12:03:30 · update #1
I am amazed at some of the answers you have been given. It is obvious that the teacher is trying to teach your son about shapes and to think of shapes in the real world. OK, some of the examples are approximations and I hope the teacher is explaining that aspect.
Some examples of a cylinder: a tubes of Smarties, a pack of Polo mints, a broom handle, a cocktail stick, a sausage, a Swiss roll, a nail, a 'round' chair leg, a telegraph pole, a curtain rod etc.
Let's clear up one misunderstanding. A cylinder is a prism. It has a regular cross sectional shape through out its length.
Some examples of prisms. All of the above. A rectangular packing box, a pencil with flats sides, a CD case, a rubber, a bath sponge, an ice cube, a glass prism etc.
OK, OK. I know there will be a lot of people who want to point out things like the pencil with a sharpened end makes it not a prism but I hope you can see how the teacher is trying to get the children to think.
A good way of doing this would be to take your son round the house and let him find things that are prisms and cylinders. You can always point out where his choice needs to be modified or qualified.
Best of luck
2006-12-03 21:08:09 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Examples Of Prisms
2016-11-14 00:32:46 · answer #2 · answered by ? 4 · 0⤊ 0⤋
This Site Might Help You.
RE:
Prism and cylinder?
My son who is 7 fetched his homework home and he had to give 10 examples of a prism and 10 examples of prism. The teacher gave him 2 examples of each with the 2 for a cylinder being a bin and a tin of beans, and the two examples for a prism being a tomblerone and a cucumber? I have looked on the...
2015-08-17 02:27:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
A prism is any 3-D shape with a uniform cross-sectional area throughout. Eg. a loaf of bread.
A cylinder would be a form of prism as its cross-sectional area is a circle.
Another prism is a milk carton as its cross-sectional area is a rectangle.
An unsharpened pencil will have a cross-sectional area of a hexagon or an octagon or a circle depending on the type of pencil, so it is also a prism.
A wedge of cheese will be a prism too as its cross-sectional area is a triangular shape.
A cucumber isn't a good example as its ends taper to a rounded end.
2006-12-03 09:01:33 · answer #4 · answered by Kemmy 6 · 0⤊ 0⤋
In geometry, an n-sided prism is a polyhedron made of an n-sided polygonal base, a translated copy, and n faces joining corresponding sides. Thus these joining faces are parallelograms. All cross-sections parallel to the base faces are the same.
Basically, a prism can have as many sides (so long as its more than one because that a cylinder as you so rightly say), just so long as they join at each end with a flat face its a prism. So a cucumber is because it isnt round, it has many little sides.
I hope this helps
2006-12-03 08:52:34 · answer #5 · answered by sportative 1 · 1⤊ 0⤋
Yes, you should be. A cucumber is a kind of cylinder. It's certainly not a prism.
Actually, the teacher sounds pathetic. I can't think of 10 examples of a prism (triangular one)! I wonder if the teacher had clarified the polygonal aspect? And if so, with 7yr olds?
There's lots of things cylindrical - pieces (usually) of broom handle, wire, a nail, a grass roller......
2006-12-03 08:55:52 · answer #6 · answered by migdalski 7 · 1⤊ 0⤋
prism cylinder
2016-01-27 03:55:59 · answer #7 · answered by Anonymous · 0⤊ 0⤋
a prism may have many sides, the object of which is to refract light. look at your engagement ring for a start. How many lampshades have diffusers? Refraction of light (bending of the beam) occurs when one 'side ' of the beam strikes the glass while the other is still within the glass this edge then goes into another medium (Air) and speeds up. The beam bends towards the other side. A magnifying glass is a prism, consider the beam entering the flat side, and leaving on the curved side...light tralels faster in air than glass, thus the outgoing beam is wider than the incoming (magnified)
2006-12-03 09:03:37 · answer #8 · answered by johncob 5 · 0⤊ 1⤋
volume of a prism = Base area x heigth
2016-03-16 02:12:06 · answer #9 · answered by Anonymous · 0⤊ 0⤋
teacher sounds an idiot.
a cucumber is an irregular shape, but if shes arguing it approximates to a prism, I'd argue it approximates to a cylinder too.
any why can no one spell toblerone?
2006-12-03 12:23:40 · answer #10 · answered by mainwoolly 6 · 1⤊ 0⤋