# maths question (GCSE)

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Thread starter 16 years ago
#1
a paralelogram has sides of 7cm and 11cm and angles of 78* and 108*. calculate the length of the longest diagonal.

I know that its all about triganometry adn that, and sine and cosine rukles. but how the hell do i do it???? you have also got to include a diagram!!!!!!
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16 years ago
#2
(Original post by ianbradshaw2002)
a paralelogram has sides of 7cm and 11cm and angles of 78* and 108*. calculate the length of the longest diagonal.

I know that its all about triganometry adn that, and sine and cosine rukles. but how the hell do i do it???? you have also got to include a diagram!!!!!!
The angles are wrong, all sngles should add upto 360* in a 4 sided shape and in a parallelogram opposing angles are the same.

2*78 + 2*108 = 372

that's 12 degrees out.
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Thread starter 16 years ago
#3
this is what it says, exactly.

A parallelogram has sides 7cm and 11cm and angles of 72* and 108*.
Calculate the length of the longer diagonal of the parrallelogram/
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16 years ago
#4
(Original post by ianbradshaw2002)
this is what it says, exactly.

A parallelogram has sides 7cm and 11cm and angles of 72* and 108*.
Calculate the length of the longer diagonal of the parrallelogram/
In a quadrilateral, the angles must add up to 360 degrees.
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Thread starter 16 years ago
#5
thanx i kinda already know that.
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16 years ago
#6
(Original post by ianbradshaw2002)
thanx i kinda already know that.
A parralelogram is a quadrilateral though.
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Thread starter 16 years ago
#7
yeh,............................ ................................ ................................ ................................ ..well done
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16 years ago
#8
So what he's saying is- those angles don't add up to 360, so there is a problem? Do you get this?
If you're going to take that tone with people who are trying to help you then you might as well leave.
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16 years ago
#9
(Original post by hitchhiker_13)
So what he's saying it, those angles don't add up to 360, so there is a problem? Do you get this?
If you're going to take that tone with people who are trying to help you then you might as well leave.
Indeed.
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16 years ago
#10
Basically, the question's wrong.
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16 years ago
#11
next time you want to ask a ****in question mate, get it right in the first place, alright?

Don't come on here shoutin the odds, you sound like a very intellectual person.
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16 years ago
#12
Not.
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16 years ago
#13
(Original post by ianbradshaw2002)
this is what it says, exactly.

A parallelogram has sides 7cm and 11cm and angles of 72* and 108*.
Calculate the length of the longer diagonal of the parrallelogram/

You said 78 degrees at the start, therefore your fault.
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