Complete example 3B on page 2 of your notes by arranging the segments in order

The similarity is,
[tex]\Delta\text{VKQ}\approx\Delta NOF[/tex]3. (B)
The sides of the similar triangles is proportional,
[tex]\frac{VQ}{NF}=\frac{VK}{NO}=\frac{KQ}{OF}[/tex]