Celina is buying fabric scraps to make koozies for her glasses. Each glass is cylindrical with a diameter of 3 inches and a height of 4 inches. The koozies will cover only the sides of the glasses. What is the amount of fabric she will use? What does this amount represent? Use 3.14 for pi. Show your work.
What you're looking for here is the surface area of the sides of the glasses (what the koozies will cover). This is also what the amount represents.
The surface area of the sides is equal to the perimeter of the base times the height of the cylinder. It makes sense logically because the sides are basically the perimeter of the base, raised all the way up along the cylinder.
SA = perimeter x height SA = pi x diameter x height SA = 3.14 x 3in x 4in SA = 37.68 in^2
