Answer:
Answer = 93.6
Step-by-step explanation:
frist multipy 9 x 13 to get 117 than divided it by 2 = 58.5, than times it by 3 since there is three sides.
(58.5 x 3 is 175.5)      
Than for the base multipy 7.8 x 9 = 70.2, but since its a tri, divided it by 2 = 35.1.
Add 58.5 and 35.1 to get 93.6
 
        
                    
             
        
        
        
Answer:
158.4 degrees. 
Step-by-step explanation:
A line is 180 degress in total so subtract 21.6 from 180. Then you get 158.4 
 
        
             
        
        
        
Answer: a
Step-by-step explanation: there is no such number 
 
        
             
        
        
        
Answer:
25
Step-by-step explanation:
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