Answer:0.299
Step-by-step explanation:
Ask siri
 
        
                    
             
        
        
        
Yo sup??
Lenght of two side will be equal to 20 in as its an isoceles triangle.
The third side will be
x^2=b^2+h^2    (by pythagoreas theorem)
=9^2+9^2
x=9√2 in
Therefore the perimeter is = 9+9+9√2
=9√2(√2+1) in
Hope this helps.
 
        
             
        
        
        
I need more info on this ? to answer.