##the perimeter of triangle is :14.47 units##

##let sides of triangle be aband c##

##perimeter of the triangle is s=a+b+c##

##a=sqrt(5^2+4^2)=sqrt(25+16)=sqrt(41)##

##|a|=6.40 units##

##b=sqrt(5^2+3^2)=sqrt(25+9)=sqrt(34)##

##|b|=5.83 units##

##c=sqrt(2^2+1^2)=sqrt(4+1)=sqrt(5)##

##|c|=2.24 units##

##s=6.40+5.83+2.24##

##s=14.47 units##