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:
-5 1/4 - (-7 1/2) = 9/4
Step-by-step explanation:
Use a calculator to check.
 
        
             
        
        
        
Answer:
a
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Let base be b, height be h
h = 7+b or we can say that b = h -7 
A = 15 cm²
General formula for area of a triangle 
A = b · h
Substitute what we know to find the height h
15 = (h-7) · h
15 = h² -7h
0 = h²-7h -15 
h = (7 ±√49 + 4·1·15)/2
h = (7 ±√109)/2
h ≈ -1.72 reject this solution because height cannot be negative
h ≈ 8.72 cm
 
        
             
        
        
        
I dont think anything does.