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PostPosted: Tue Aug 26, 2008 8:55 am 
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Location: East Kent
I am obviously missing something but can you help me clarify teh answer to Q47.

Susan drew an isosceles triangle with angles A B and C.

Angle A measured 70 degrees
Angle A and B have a difference of 30 degrees.

Give angle C



Answer is 40 degrees.


My working out was this...

Isosceles triangle has 2 angles the same.
Angles in a triangle add up to 180.

If A & B differ by 30 degrees (making B 40) then angle C must be 70.

If A & B different then C must equal A or B.

70 +70 +40=180

70 +40+40 =150.

so Angle A & C must be equal C=70 degrees.



I am now officially confused so can anyone shed some light on this for me.
If I can;t understand then how can I eplain it.. :oops:


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PostPosted: Tue Aug 26, 2008 9:24 am 
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An isosceles triangle has two equal angles - from the given information A and B cannot be the equal angles.

Does A=C work? Yes it fits the info so go no further.


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PostPosted: Tue Aug 26, 2008 9:31 am 
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Location: East Kent
:oops: :oops:

I told you my brain wasn;t in gear.

We had the right answer all along.

Today is one of those days!!

Thanks for your help.


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PostPosted: Tue Aug 26, 2008 9:31 am 
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Post Bank-holiday brain fade .... don't worry about it :lol:


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PostPosted: Tue Aug 26, 2008 2:52 pm 
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Hi yoyo123

On a scale of 1-10, how good was the question?

Regards

Mike

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Mike Edwards is a co-author of The Tutors product range.


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PostPosted: Wed Aug 27, 2008 7:56 am 
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Location: East Kent
it was a good question , teased out a lot of knowledge.

Going over with a pupil and either getting them to explain how they came by answer, or working through it with them would also be valuable.


I'd give it 8!
(even with post holiday brain)


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PostPosted: Wed Aug 27, 2008 8:42 am 
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Hi yoyo

I'm surprised G55 did not spot that 8! is outside the range.

8! is 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320

I didn't think it was that good.

Regards

Mike

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Mike Edwards is a co-author of The Tutors product range.


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PostPosted: Wed Aug 27, 2008 9:44 am 
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Perhaps because I've been working and not on-line ...


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PostPosted: Wed Aug 27, 2008 2:41 pm 
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I wrote it with my literacy head and not my maths head!!

it is worth an eight exclamation Mike, good but not as good as eight factorial.


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PostPosted: Thu Aug 28, 2008 3:03 pm 
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Hi yoyo

I appreciate that 8! was outside the range given.

However 8 out of 10 is also incorrect.

The answer is 10 out of 10. The question was rhetorical!!!

For Maths 11+ multiple-choice tests set by NFER it would not be possible to improve on the question, therefore it is a perfect question.

Hi G55

What is work?

Work is a series of events for which you receive no pleasure and for which you are paid at a far lower rate than what you are actually worth.

Haven't you been "indulging in your vocation" where the pleasure you attain far outweighs the renumeration you receive?

Regards

Mike

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Mike Edwards is a co-author of The Tutors product range.


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