Kenneth S. answered • 12/06/17

Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018

similar triangles: RST & UVW.

Therefore RS/UV = ST/VW = RT/UW ... corresponding sides of similar triangles are

**in proportion**.To use this fact reliably, you would have to know WHICH sides of triangle RST measure 9 & 12 inches, and which side (BY NAME) is 42 inches in triangle UVW.

As it is, you cannot determine an answer!

*The 'shorter' & 'longer' remark is not adequate.*
Hope C.

12/06/17