Question

I don't understand the missing length n on the projection.

Answer 1

First, we find the ratio between the triangles by just dividing side

`(20)/(12)=(5)/(3)`

Then, we find n multiplying 8 by the scale factor

`\begin{gathered} n=18\cdot(5)/(3) \\ n=6\cdot5 \\ n=30 \end{gathered}`

Hence, the answer is 30.