PLEASE HELP. 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.

If you roll out a cylinder, you will notice that width is the same distance as the circumference of the circular base. This means that if you know the circumference of one of the bases, then you multiply it by the height of the cylinder to find the surface area of the lateral surface. You add the surface area of the lateral surface to the base * 2 (because there are two bases) then you get the total surface area

Step-by-step explanation:

  21.3

step-by-step explanation:

multiplying the given equation by c/sin(25°), we get

  c = 9/sin(25°) ≈ 21.2958 ≈ 21.3

we assume "c" is the length of ab, the side opposite angle c in triangle abc.

cheater

step-by-step explanation: