Question

Triangle ABC is an obtuse triangle with the obtuse angle at vertex B. Angle A must be

less than 90°
greater than 90°
congruent to angle B.
congruent to angle C.

Answer 1

Less than 90

Explanation:

Answer 2

Less than 90

Explanation:

All angles in a triangle add up to 180 degrees.

An obtuse angle is an angle that is greater than 90 degrees.

For simplicity's sake, let the obtuse angle be 91 degrees.

180-91=89

The remaining angles in an obtuse triangle are always acute.

Sorry for the trashy answer.