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primary 6 | Maths | Geometry
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Sanjana
Sanjana

primary 6 chevron_right Maths chevron_right Geometry chevron_right Singapore

Pls help to explain

Date Posted: 1 week ago
Views: 12
Eric Nicholas K
Eric Nicholas K
1 week ago
The only rhombus that I see is that square. At first I thought that the third shape is a rhombus, but upon closer inspection it is not. Remember that a rhombus is a figure whose four sides are equal in length. This includes squares.
Eric Nicholas K
Eric Nicholas K
1 week ago
Some important things to know.

A random four sided figure is nameless.

Have two sides being parallel to each other and you call the new shape a trapezium.

Have two sets of opposite sides being parallel and equal in length and you have a parallelogram.

If the parallelogram has all four angles being 90 degrees, it is called a rectangle.

If the parallelogram has all four sides equal in length, it is called a rhombus.

If the rectangle has all four sides being equal, it is called a square.

If the rhombus has all four angles being 90 degrees, it is called a square.
Eric Nicholas K
Eric Nicholas K
1 week ago
So a square is also the nicest four sides figure you can ever see.

A square can therefore also be called as the following.

1. A rhombus with all four angles being 90 degrees.

2. A rectangle with all four lengths equal.

3. A parallelogram with all four sides being equal and all four lengths being 90 degrees

And so on.
Sanjana
Sanjana
1 week ago
Understood, Many Thanks for such a detailed explanation
J
J
1 week ago
A square is essentially a proper subset of all of the above types of quadrilateral.

For option (3), notice that opposite sides are parallel and equal in length, but adjacent sides are not equal.


The top right and bottom left sides are obtained by moving 1 unit horizontally and 2 units vertically on the grid.

The top left and bottom right sides are obtained by moving 2 units horizontally and 2 units vertically on the grid.

So this figure is actually a parallelogram

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Preethy sudhan
Preethy Sudhan's answer
1 answers (Tutor Details)
1st
Only the opposite angles are equal
Sanjana
Sanjana
1 week ago
Answer is given as 4 for this, which is a square, we thought its 3
TJHK
TJHK
1 week ago
For option 1, we can see that it is a trapezium, so it is definitely wrong.
For option 2, we know that it's a rectangle, so it's wrong too.
The problem comes with (3) and (4) is because this question is also testing us whether we read the square grid carefully and our concept of rhombus.
To see clearly, the breadth of the shape(parallelogram) is not equal to the length. Therefore, since (4) has 4 equal sides which is a square, (4) would be the right answer.