The distacne between the points (x1,y1) and (x2,y2) is

so the distance between (4,5) and (10,13) is
well, first
x1=4
y1=5
x2=10
y2=13
so



D=√100
D=10
the distance is 10 units
 
        
        
        
6 be cause 8 times 6 equals 48
        
                    
             
        
        
        
Try this:
1) area of f-yard is 60*70=4200 feet²;
2) area of b-yard is 10*30=300 feet², according to condition '<span>on half of his back yard' this area should be 0.5*300=150 feet</span>².
3) total: 4200+150=4350 feet².
        
                    
             
        
        
        
Arc length = 2 π R (C/360) 
where:
C  is the central angle of the arc
R  is the radius of the arc
arc length = 2 π R (137/360) = 2.39R