Are ( -1.5, 6)T and (2, 2)T orthogonal?
No: the dot product is -3 + 12 = 9.
The dot product is not zero, so the two vectors are not orthogonal. You don't even have to think about lengths. (Remember that this test detects orthogonality no matter what the length of the vectors). The next chapter will discuss what a non-zero dot product of two vectors gives you.
You have reached the end of the chapter. Normally at this point you would review the following terms:
Click on a term to see where it was discussed in this chapter. Remember to click on the "Back" arrow of your browser to get back to this page.