In this unit, you calculated the surface area of solid figures composed of polygons, such as rectangles and triangles. but imagine finding the surface area of a cylinder—a solid figure that has several curved surfaces. a cylinder is made up of two circular bases and a curved (lateral) surface in between. develop a formula for finding the surface area of the outside of a cylinder based on what you know about the circumference of a circle and the areas of circles and rectangles. (hint: think about rolling a rectangular piece of paper into the shape of a cylinder.) discuss your approach and why it works.