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PostPosted: Thu Aug 16, 2012 10:10 am 
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Posts: 533
I am sure that these are really silly questions, but even google hasn't helped me this time :(

Qu. 34
Nina has some sticks of different lengths. She can lay the sticks end to end to make triangles like this (gives a picture of a scalene triangle). Nina chooses sticks with lengths 2cm,3cm,5cm,6cm,8cm
Which of these sets of 3 sticks can Nina use to make a triangle?

2cm,3cm,5cm
2cm,3cm,6cm
2cm,3cm,8cm
3cm,5cm,6cm
3cm,5cm,8cm

Qu.38
Bulu has a 2D shape
All of its sides have are same length
Which of these cannot be Bulu's shape

A right-angled triangle
an equilateral triangle
a square
a rectangle
a parallelogram


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PostPosted: Thu Aug 16, 2012 10:15 am 
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bel wrote:
Qu.38
Bulu has a 2D shape
All of its sides have are same length
Which of these cannot be Bulu's shape

A right-angled triangle
an equilateral triangle
a square
a rectangle
a parallelogram


A right angle triangle will always have at least one side a different length, also a rectangle will have 2 sides of one length and 2 sides of another length. A square and equilateral triangle will have all sides the same and I suppose a parallelogram can too!


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PostPosted: Thu Aug 16, 2012 10:17 am 
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Thanks hermanmaster, I could see that but why is it not also a rectangle which can't have 4 sides the same otherwise it would be a square?


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PostPosted: Thu Aug 16, 2012 10:24 am 
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I think rectangle is one of those that can't be the defined shape, along with a right angled triangle. the one that sits in the middle is the parallelogram.


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PostPosted: Thu Aug 16, 2012 10:32 am 
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Joined: Mon Aug 22, 2011 8:20 pm
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Location: Warwickshire
Quote:
Qu. 34
Nina has some sticks of different lengths. She can lay the sticks end to end to make triangles like this (gives a picture of a scalene triangle). Nina chooses sticks with lengths 2cm,3cm,5cm,6cm,8cm
Which of these sets of 3 sticks can Nina use to make a triangle?

2cm,3cm,5cm
2cm,3cm,6cm
2cm,3cm,8cm
3cm,5cm,6cm
3cm,5cm,8cm

To make a triangle the sum of the two shorter sides must exceed the length of the longest side - so 3cm,5cm,6cm is the only one which fulfils this requirement.


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PostPosted: Thu Aug 16, 2012 10:34 am 
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Location: Warwickshire
bel wrote:
Thanks hermanmaster, I could see that but why is it not also a rectangle which can't have 4 sides the same otherwise it would be a square?
You could argue that a square is actually just a special case of a rectangle (and a special case of a parallelogram too for that matter).


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PostPosted: Thu Aug 16, 2012 10:38 am 
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Thanks :)


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