Answer:
a function of an angle, or of an abstract quantity, used in trigonometry, including the sine, cosine, tangent, cotangent, secant, and cosecant, and their hyperbolic counterparts.
Step-by-step explanation:

It looks like your first selection (a) is appropriate.
30 I believe, sorry if I am wrong, I am bad at math and history.
Answer:
548
Step-by-step explanation:
area for the two triangles are 68
and for the two bigger rectangles is 320
and for the small rectangle 180
then add it all up and get 548