This is C. cos Z = sin (90 - Y)
12: Right Angle.
There is a box where K and M is located
13: This one is very confusing. But I would say the answer is either acute or right.
The triangle makes the square acute. But there is a square located.
Hope this helps.
7 days OR 168 hours
One full axis rotation is the length of one day (24 hours)
