Abd is a right angled triangle so by pythagoras we know

and to calculate h we need to use the sine rule

i hope this helps
 
        
        
        
3x - 4y = 9 and 2x + 3y = 7, which of the following would be the best method?
        
                    
             
        
        
        

above  is the distance formula, plugging your numbers from P(x1,y1) and Q(x2,y2).

or
 
 
        
             
        
        
        
Answer
Ivanna started jogging at 7:20
        
                    
             
        
        
        
P=2l+2w
W=7+3l
So substitute into the original equation
P=2l + 2(7+3l)
78=2l +14 + 6l
-14 -14
—————-
64=8l
8=length
W=7+3l
= 7+3(8)
=7+24
=31
Check your work
Perimeter=8+8+31+31
=78
Hope this helps