The length of a rectangle is three times it's breadth. If the area is 108cm find the length of a diagonal

Answer 1

L=3B

A=LB=3B^2=108

B^2=108/3= 36

B=6

L=18

D=sqr(6^2+18^2)= sqr(36+ 324)= sqr360

=6sqr10 cm = about 18.97 = about 19 cm = Diagonal