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by camitava » Mon Nov 05, 2007 8:34 pm
As isoceles right-angled triangle so base = height = a and hyp = h
So 2a^2 = h2 using Pythagorus theorem.
so h = a * sqrt(2)

And 2a + h = 16(1 + sqrt(2))
2a + a * sqrt(2) = 16(1 + sqrt(2))
or a * sqrt(2) (sqrt(2) + 1) = 16(1 + sqrt(2))
a = 16/sqrt(2).

h = 16 => IMO B
Correct me If I am wrong


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by samirpandeyit62 » Mon Nov 05, 2007 8:44 pm
I agree with Amitava it should be 16
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by gabriel » Thu Nov 08, 2007 11:04 am
mtr wrote:Quick question where I am going wrong with my logic. Isn't a right angled isoceles triangle a 45:45:90 triangle? So wouldn't the the lengths of the sides follow x : x : x*sqrt(2) ? so then the perimeter would be x + x + x * sqrt(2) as well? The perimeter they give is 16+16sqrt(2), so if x is 16, then wouldn't the perimeter be 32+16sqrt(2)? Getting the 32 from 16*2 for the two equal length sides?

Mike
A 45:45:90- triangle is a isosceles triangle ( a right angle isosceles triangle to be precise), but all isosceles triangles are not 45:45:90 triangle .. A isosceles triangle is a triangle in which 2 of the sides have equal length.. Read this https://www.mathopenref.com/isosceles.html ..

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by mtr » Thu Nov 08, 2007 11:08 am
Yea but the one in this problem is a right isoceles triangle. right Gabriel?

I deleted my last post because I thought the poster was saying the answer was E, but now I realize that was just what he chose, not the correct answer.
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by gabriel » Thu Nov 08, 2007 11:18 am
mtr wrote:Yea but the one in this problem is a right isoceles triangle. right Gabriel?

I deleted my last post because I thought the poster was saying the answer was E, but now I realize that was just what he chose, not the correct answer.
Oh my mistake.. I thot u meant that all isoceles trianhles are 45:45:90 triangles (your post clearly did not say that .. I just misread it ) .. sorry about the confusion ..

btw how did you delete your post... i thot only a moderator/monitor could do that, I mean u can delete the contents of your post, but you cant delete the whole post itself.. can you? ..
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by mtr » Thu Nov 08, 2007 11:33 am
gabriel wrote:
btw how did you delete your post... i thot only a moderator/monitor could do that, I mean u can delete the contents of your post, but you cant delete the whole post itself.. can you? ..
Right after you post there will be the edit button in the upper right corner of the post, and next to it should be a X. Hit that and it will delete it. I think it is only there for a limited time though.
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by gabriel » Thu Nov 08, 2007 11:47 am
mtr wrote:
gabriel wrote:
btw how did you delete your post... i thot only a moderator/monitor could do that, I mean u can delete the contents of your post, but you cant delete the whole post itself.. can you? ..
Right after you post there will be the edit button in the upper right corner of the post, and next to it should be a X. Hit that and it will delete it. I think it is only there for a limited time though.
Well have reported the situation to Eric.. posts can usually be only deleted by moderators .. there's some funny things happening on the board for the past few days .. but am sure it is not something that Eric can't fix .. Right Eric?? ..
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by beatthegmat » Thu Nov 08, 2007 12:40 pm
mtr is is correct, that a user can delete his own post. That feature has existed for a while now.

With regard to the other funny stuff, I'm trying to investigate!
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by aim-wsc » Sat Nov 10, 2007 9:00 am
well well well!
... dont expect this from a monitor, but yeah I can understand, he sees the forums with greater control. ;)
gabriel wrote:
mtr wrote:
gabriel wrote:
btw how did you delete your post... i thot only a moderator/monitor could do that, I mean u can delete the contents of your post, but you cant delete the whole post itself.. can you? ..
Right after you post there will be the edit button in the upper right corner of the post, and next to it should be a X. Hit that and it will delete it. I think it is only there for a limited time though.
Well have reported the situation to Eric.. posts can usually be only deleted by moderators .. there's some funny things happening on the board for the past few days .. but am sure it is not something that Eric can't fix .. Right Eric?? ..
All right here's ultimate reply. 8) FYI: any member can delete his own post if its located at the end of the thread. However Moderators/Monitors have greater access and can edit/ modify or even delete the any posts entirely (including admin's posts :shock: )

& regarding other funny stuffs I am not aware of them as I am not active member anymore... :(
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