Math problems and trigonometric functions in senior one are not difficult to solve. I just haven't written for a long time, and I forget how to write, so I need a detailed process.

The first choice is C, because S= 1/2abSinC, C equals 90 degrees, so it is a right triangle, and tanB=b/a= root number 3, so B=60 degrees.

The second choice is B, because it rotates four times per minute, and the cycle of each rotation is 15 seconds, so ω=2π/T=2/ 15π, and the radius of the waterwheel is 3, so the amplitude is 3, the highest distance from the water surface is 3+2=5, and the lowest distance is 2-3 =-/.

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