Answer:
120
Step-by-step explanation:
Cylinder formula is 2pi(r)^2 + 2pi(r)h
2pi(0.25)^2 + 2pi(0.25)(1)
Chuck that in calculator and evaluate
Imagine the unit circle. The cot(theta) is a line from (0,1) to (-4,1). Imagine it is part of a triangle with the origin (draw it!).
Then the hypotenuse length is √(1+4²) = √17.
The sine rule says that sin(90)/√17 must equal sin(theta)/4, and sin(90)=1, so