The ratio of the heights of two similar rectangular prisms is 4:5. What is the ratio of their lateral areas?

Question

The ratio of the heights of two similar rectangular prisms is 4:5.  What is the ratio of their lateral areas?

anonymous · Answer

area = length × length

anonymous · Answer

(More precisely, the units of area are the units of length squared)

anonymous · Answer

Thanks ; i have 1 more: Each dimension of a rectangular prism is increased by 80%.  What percent of the original volume is the volume of the new prism?

 A.51.2 percent

 B.324 percent

 C.583.2 percent

 D.64 percent

anonymous · Answer

Similar reasoning. Volume is cubic units, so you need to cube the scale factor.

anonymous · Answer

N.B. that the scale factor if being increased by 80% is k=1.8

anonymous · Answer

Thank you :)