Any Maths peeps?

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mick665544
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#1
Report Thread starter 18 years ago
#1
Can anyone help with this prob?
Put it on my site for u all.

http://www.cobsc.co.uk/question.jpg

Thanks
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elpaw
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#2
Report 18 years ago
#2
is A a right angle?
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gemgems89
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#3
Report 18 years ago
#3
(Original post by mick665544)
Can anyone help with this prob?
Put it on my site for u all.

http://www.cobsc.co.uk/question.jpg

Thanks
I've had too much of a busy day to think, but I know the bottom bit is a trapezium which may come in useful..there again it may not.
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mick665544
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#4
Report Thread starter 18 years ago
#4
(Original post by elpaw)
is A a right angle?
It doesnt say so, diagram i have says not to scale and doesnt show right angle sign.

Whole Question is:

In the triangle ADE
BC is parallel to DE

AB = 8cm
AC = 5cm
BD = 4cm
BC = 9cm

a) work out the length of DE
b) Work out the length of CE


Not sure about trapezium rule, dont you have to know the area, would have two unknowns in that equation.
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elpaw
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#5
Report 18 years ago
#5
(Original post by mick665544)
It doesnt say so, diagram i have says not to scale and doesnt show right angle sign.

Whole Question is:

In the triangle ADE
BC is parallel to DE

AB = 8cm
AC = 5cm
BD = 4cm
BC = 9cm

a) work out the length of DE
b) Work out the length of CE


Not sure about trapezium rule, dont you have to know the area, would have two unknowns in that equation.
ah you haven't put down the length bc. that helps.

DE = (4+8)/8 * 9 = 13.5cm

CE = 4/8 * 5 = 2.5 cm
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gemgems89
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#6
Report 18 years ago
#6
(Original post by elpaw)
ah you haven't put down the length bc. that helps.

DE = (4+8)/8 * 9 = 13.5cm

CE = 4/8 * 5 = 2.5 cm
Ah I knew there must have been something wrong!
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mick665544
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#7
Report Thread starter 18 years ago
#7
(Original post by elpaw)
ah you haven't put down the length bc. that helps.

DE = (4+8)/8 * 9 = 13.5cm

CE = 4/8 * 5 = 2.5 cm


how did u manage that?
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:P:P:P:P:P
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#8
Report 18 years ago
#8
(Original post by mick665544)
how did u manage that?
Its a trapezium ... h(a+b)/2
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elpaw
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#9
Report 18 years ago
#9
(Original post by mick665544)
how did u manage that?
scale factors
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