Question

What is the smallest integer value for IK for which parallelogram IJKL will have an obtuse angle at J ?

IJ = 12 Kj =5

Answer 1

if IK is 13 we get a 90 degree angle by the Pythagorean Theorem
So we have to bump IK up by 1
If IK is longer than 13, we get an obtuse angle by the Pythagorean Inequalities
So the answer is clearly 14