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Mathematics 11 Online
OpenStudy (imstuck):

Measurement question...totally stumped! Need help!

OpenStudy (imstuck):

|dw:1408498901765:dw|

OpenStudy (imstuck):

Can ANYONE see their way to the answer to this?!

OpenStudy (help!!!!):

I really hope these are measured carefully

OpenStudy (imstuck):

All I know is that AD is 27, AC is 2x and BD is x. BC and CD are not equal in length.

OpenStudy (imstuck):

I really have no clue here at all!

OpenStudy (help!!!!):

2x+x=27

OpenStudy (help!!!!):

x=9

OpenStudy (imstuck):

No that's not right because there is an overlap there. Look closely at it.

OpenStudy (help!!!!):

ahh

OpenStudy (imstuck):

Yes...ahh...That's what I said! OMG!

OpenStudy (help!!!!):

@ganeshie8

OpenStudy (xapproachesinfinity):

Can we do this by inequalities!

OpenStudy (xapproachesinfinity):

hmmm thinking to see if there is something that can help

OpenStudy (xapproachesinfinity):

i proved that x=x lol^_^

OpenStudy (xapproachesinfinity):

can we say that BD=3CD ration of BD to CD= 3 perhaps? this way we can set to equation

OpenStudy (xapproachesinfinity):

this is a matter of ratios

OpenStudy (xapproachesinfinity):

@IMStuck

OpenStudy (xapproachesinfinity):

i meant two equations

OpenStudy (xapproachesinfinity):

but it doesn't look like the ratio is 3 does! may be if you check the original scaling of that segment

OpenStudy (xapproachesinfinity):

if my assumption is correct we would get 3CD=x 27-cd=2x x=11.57 CD=3.85

OpenStudy (xapproachesinfinity):

what do you think?

OpenStudy (xapproachesinfinity):

any ideas hehe

OpenStudy (anonymous):

I have an idea but it's missing one key component... Draw the diagram like so: |dw:1408497291641:dw| We then have two obvious equations: \[\begin{cases}a+b+c=27\\ a+b=2(b+c)\end{cases}\] If you can find one more linear (or maybe non-linear?) relation that's fundamentally different from these two, I think you have a good chance of finding the value of \(x=b+c\).

OpenStudy (imstuck):

I still don't get it and neither does the teacher that I did my student teaching under. I asked the student I was tutoring if there was something he left out of the specifics of this and he said no, but no one can seem to get x.

OpenStudy (anonymous):

I'm wondering if expanding the drawing a bit might reveal another useful relation. Consider the square, |dw:1408498553652:dw|

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