Question

the length of a rectangle is 3 times its width and the length of its diagonal is 6 the sign of diagonal 10 cm. what is the perimeter of the rectangle

Answer 1

Let width be x then the length will be 3x 
by Pythagoras theorem,

x=6 

length = 18, Breath = 6
Perimeter = 2(18+6)
= 48 cm

hope it'll help :)