An obtuse triangle has one obtuse angle, or an angle that measures more than 90° but less than 180°. Options 1 and 2 are not correct, because these are acute angles.
So, one of the angles must be 40°, and the other may be 100° or 120°.
The measures of the angles in a triangle add up to 180°.

The other two angles are 40° and 100°.
Answer:

Step-by-step explanation:
Given



Required
Find the height of the prism
Volume (V) is calculated as:

Substitute values for V, L and W

Make H the subject



Divide:


The height of the prism is: 
Answer: ABC is congruent to A’B’C because yo can nap ABC to A’B’C using a rotation of 180 degrees about the origin, which is A rigid motion
Angle EBD and Angle DBE are adjacent