(pi,2),(pi/4,0) find the distance and midpoint. Can you do it step by step?

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

Urgent? will give brainliest to the first correct answer what is the area of the figure?

The angle of elevation from point a to the top of a cliff is 38 degrees . if point a is 80 feet from the base of the cliff , how high is the cliff ?