May someone answer these 4 questions. This is all i ask of you

You see the number above the square? Divide that by 2, then multiply it by the base.
bh/2
base= b
height= h
The number next to the line in the middle is height and the line that is perpendicular to it is base.

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)