Is it possible to prove a triangle ABC is isosceles, given only that Ậ = 50º
No. Since an isosceles triangle must have two equal angles, but the onlyOriginally 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.
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)
i will post his answer for a laugh, see what he manages to come up with