Question

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?

Let two angles of a triangle be obtuse.

Let each angle of a triangle be acute.

Let only one angle of a triangle be obtuse.

Let two angles of a triangle be right.

Answer 1

Let only one angle of a triangle be obtuse.