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## Is a square a rectangle?

(50 Posts)
SPBisResisting Fri 13-Sep-13 10:38:59

I know that the answer is 'yes' however, what are we meant to be teaching children? There's just been a question in my dd's book that makes it seem as though they didn't want the squares counted as rectangles iyswim. So what will they be telling her atschool?

grabaspoon Fri 13-Sep-13 10:39:54

Squares are not rectangular

SPBisResisting Fri 13-Sep-13 10:40:57

Well a square is a special type of rectangle.

Fri 13-Sep-13 10:40:59

Squares are a special type of rectangle. This is what they will teach her at school (maths teacher here!)

MrsRajeshKoothrappali Fri 13-Sep-13 10:41:08

Rectangles have two sides of equal length and all angles are the same.

So a square is a rectangle.

Fri 13-Sep-13 10:41:52

I thought a square was a square and a rectangle was a rectangle, one has 4 equal sides and the other does not. I have never heard this "special type of rectangle" stuff.

Fri 13-Sep-13 10:41:56

A rectangle is a four sided shape with two pairs of parallel sides and four right angles.

A square is a four sided shape with four equal sides and four right angles.

SPBisResisting Fri 13-Sep-13 10:42:17

Thanks. So they should be counted! I will go back and try to explain

SPBisResisting Fri 13-Sep-13 10:43:11

MummyPig, well a square is a rectangle where the two non-opposite sides happen to be of equal length

MamaChubbyLegs Fri 13-Sep-13 10:44:32

I thought squares and rectangles were both quadrilaterals, but a square is not a rectangle, because a square needs equal sides?

Its been a while since I was in primary school though so I could be wrong

K8Middleton Fri 13-Sep-13 10:44:46

A rectangle is a 4 sided shape with 4 corners all with a 90 degree angle. Therefore a square is a type of rectangle.

I have no idea what they teach at primary school but at secondary a square's a rectangle.

Peanate Fri 13-Sep-13 10:45:47

A square has four equal sides. A rectangle has two sets of equal sides (but each set is different lengths) all at right angles.

Both are quadrangles, but I would not consider a square to be a rectangle.

Fri 13-Sep-13 10:46:24

Yes, a square is a type of rectangle. Just like a right-angled triangle is still a triangle despite other triangles looking quite different. I'd just use the word paralellogram for both, though, as there isn't a preconceived idea of the aspect ratio of adjacent vertices. Or, in English, people know that it either a square or a traditional rectangle or even a rhombus.

MamaChubbyLegs Fri 13-Sep-13 10:46:33

No, surely there aren't special rectangles... thats like saying a rhombus is a square thats fallen over a bit!

Beehatch Fri 13-Sep-13 10:46:57
SanityClause Fri 13-Sep-13 10:47:38

Yes, a square is a rectangle. It is a specific type of rectangle, where all four sides are the same length.

A square is also a specific type of rhombus, where all four angles are right angles.

And, wait for it, this means that a rhombus can never be a triangle, unless it is a square!

K8Middleton Fri 13-Sep-13 10:48:16

Well no, that's not the same mamachubby because the angles are different on a square and a rhombus.

SanityClause Fri 13-Sep-13 10:49:05

Sorry, a rhombus can never be a rectangle unless it is a square.

SPBisResisting Fri 13-Sep-13 10:49:12

Mama, no but a square is a rhombus

"a rhombus can never be a triangle, unless it is a square!"

I don't understand that. A rhombus has four sodes, surely?

SPBisResisting Fri 13-Sep-13 10:49:57

ah x post.
Right, so in primary school she will be taught that a square is a rectangle? Good

ClayDavis Fri 13-Sep-13 10:50:03

They should be teaching that a square is a rectangle. However I do remember an AIBU thread where that was marked as incorrect. I would always except it as a correct answer.

How is the question worded that makes it seem like it would be incorrect?

K8Middleton Fri 13-Sep-13 10:51:06

Oh goodness I'm doubting myself now.

<gets out baby dd's shape sorter and protractor>

MamaChubbyLegs Fri 13-Sep-13 10:51:30

well this is all too confusing to me

ClayDavis Fri 13-Sep-13 10:53:16

Have mentioned parallelograms yet?

SPBisResisting Fri 13-Sep-13 10:53:18

Clay, it's a picture of a load of wrapped presents, some rectangular, some square and some odd shapes. The question is "how many rectangles?"

(I'm going to ignore that the ribbon means there are actually many many sub-rectangles within the main rectangles)

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