Water is being withdrawn from a conical reservoir 2 feet in radius and 10 feet in depth (the point of the cone is down) at a rate of 4 ft^3/min. how fast is the area of the surface of the water changing when the water is 6 feet deep

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.