Question:(Attached) 59 b and c (I did a).

Answers:

b: About 8.5 inches by 2 inches.

c: 20/sqrt(3) inches by 20*sqrt(2/3) inches

My work is also attached for #59 a (Page 12/14 of pdf file) which I did successfully. I cannot complete b to get to c and for b my problem is that, I cannot find a relationship between the two variables to differentiate a function with one variable. As for #59 b, I thought I was on to something and wrote some unnecessary (I think) things.

Any help would be greatly appreciated!

Thanks in advance!