From the side the prism looks like a rectangle because you can't see the triangular ends. The rectangle would have a height of 4 and length 5. When you look at the prism end on you only see the triangle. The question doesn't say what type of triangle it is but it could be a right-angled triangle with a base 3 and height 4, like the side-on rectangle. It could be an isosceles triangle. To draw the isosceles triangle you would draw the base first, length 3, mark the middle of the base and draw a perpendicular line from the base upward, length 4. This perpendicular is the height. Join the top of this line to each end of the base and you get your isosceles triangle. I hope this helps you to draw your prism.