Could anyone help me on number 3?

The first hexagon is dilated to form the second hexagon select the answers from the drop box menus to correctly complete the statement

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

The area of a circle is equal to 1 dm². find the radius of the circle.