Is it possible to prove a triangle ABC is isosceles, given only that Ậ = 50º

???????

thanks

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- March 16th 2006, 01:08 AMjacsIs this possible?
Is it possible to prove a triangle ABC is isosceles, given only that Ậ = 50º

???????

thanks

- March 16th 2006, 04:45 AMCaptainBlackQuote:

Originally Posted by**jacs**

constraint on a general triangle is that the angle sum is 180 degrees.

So a triangle with an angle of 50 degrees could have its other angles as

60 and 70 degrees and hence need not be isosceles.

RonL - March 16th 2006, 04:50 AMjacs
thanks for that, that is pretty much what i thought too, but teacher insists it can be done.

Should get his working tomorrow, which will prove interesting. I guess he must know some alternate universe geometry that we don't.

Or perhaps he just gave us the wrong info, (wouldnt be the first time)

lol

i will post his answer for a laugh, see what he manages to come up with

thanks CaptainBlack - March 16th 2006, 06:40 AMc_323_h
how come the other two angles couldn't be 65 degrees?

- March 16th 2006, 08:19 AMCaptainBlackQuote:

Originally Posted by**c_323_h**

without some additional conditions).

RonL - March 16th 2006, 02:39 PMThePerfectHackerQuote:

Originally Posted by**jacs**

(No idea how to spell it) - March 16th 2006, 02:53 PMCaptainBlackQuote:

Originally Posted by**ThePerfectHacker**

RonL - March 18th 2006, 04:55 AMjacs
Well, it turns out, ooopps surprise, he forgot a vital peice of information, like the second angle is also 50.

So that solves that little quandary, thanks for you input everyone.

jacs