4 (a) The diagram shows a solid triangular prism. The dimensions are in metres. (i) Calculate the volume of the prism. (ii) Calculate the total surface area of the prism. (b) The diagrams show the cross-sections of a ramp A and a triangular prism B. The triangular prism B can move up and down the ramp A. The ramp is inclined at 25° to the horizontal. (i) When the prism has moved 2 m up the ramp, it has risen h metres vertically. Calculate h. (ii) As it moves, the uppermost face of the prism B remains horizontal. The length of the horizontal edge of the face is 0.6 m. The length of the vertical edge of the prism is y metres. Calculate y.