Cant see the rest of the question ;-;
        
             
        
        
        
Answer:
Triangle
Step-by-step explanation:
The triangle has the formula that have b*h/1/2.
 
        
                    
             
        
        
        
Answer:
They are identical triangles.
Step-by-step explanation:
Angles in a triangle add up to 180 degrees.
The triangle with 39 and 90 has a missing angle of 51 degrees, and the triangle with 51 and 90 vice versa.