Question

I got these questions wrong on my practice exam... Can you guys help me understand why?

1.) In a geometry class, the students were asked to prove the theorem below by contradiction:
Theorem: A triangle has at the most one obtuse angle.
Heather begins the proof with an assumption. Which statement will she most likely use as an assumption?
A.) Let two angles of a triangle be obtuse
B.) Let each angle of a triangle be acute
C.) Let only one angle of a triangle be obtuse.
D.) Let two angles of a triangle be right.

Answer 1

A triangle can't have more than one obtuse angle -- try drawing it. It wouldn't be a triangle. Since this is an answer that has to do with an obtuse angle and contradicts the theorem, I'm pretty sure it's right. What answer did you pick?

Answer 2

I chose C @greenfrog

Answer 3

I would've chosen it, too :)
Does that help? Do you know if I was right? @Gunderson1881

Answer 4

It was wrong @greenfrog

Answer 5

Oh. I'm really sorry :(