Area cm2 ratio 2:1

Question

HI currently have a problem I cant get my head around say I have worked out an area say 15cm² and I need to work out the length and width with a ratio of 2:1 how would i go about this

Answer 1

Area = LW

L/W = 2/1 = 2

L = 2W

A=(2W)W = 2W^2 = 15

W^2 = 15/2

W = sqr(15/2) = about 2.74 cm

L =2W = about 5.48 cm