You're a Little Stupid
You got 9/10 questions right!
Or at least careless. Better go back and recheck your answers!
Are You Stupid?http://www.blogthings.com/areyoustupidquiz/I messed up a baker's dozen. Never heard this expression before

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LOL! You're definitely not stupid, David! The triangle sides are always 3, 4, 5...Pythagorean theorem...ie...25 = 9 + 16 (square of the legs = square of hypotenuse or longest leg)....
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But Pythagorean theorem is only valid for a right-angled triangle

When the angle gets bigger than 90°, the third side becomes longer:

(The above pics are not scaled, They only shall illustrate the angles.)
So the question is not correct; it's not well-defined. There are triangles where the shorter sides are 3 and 4 inches, but the longest side is more than 5 inches.
See, David, it's not your fault. Those blog-thing questions are stupid, not you