Graded Discussion Discussion Topic
27 Res
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.
B
maximu