number theory
posted by kay .
According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with DAB = x, and ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the perpendicular bisector to AB at P. ThenPA = PB andPC = PD. So the trianglesPADandPBC have equal sides and are congruent. Thus PAD = PBC. But PAB is isosceles, hence PAB = PBA. Subtracting, gives x = PAD− PAB = PBC − PBA = 90◦. This is a preposterous conclusion – just where is the mistake in the “proof” and why does the

So the trianglesPADandPBC have equal sides and are congruent > flawed
You have 2 sides of one equal to 2 sides of the other, but no angles equal, so you cannot say they are congruent. (You need either SAS )
Anything after that is bogus. 
i like to eat A is in PDC nuggets