Lesson 3.3 Con’t: Surface Area – Problem Solving
NOTES
1. A cylindrical shipping tube is 48 inches tall and 6 inches in diameter.
a) What is its surface area in square inches?
2. Harry has to paint the walls and ceiling of a room that is 12 ft long, 10 ft wide, and 8 ½ ft
high. There is a 6 ft by 4 ft window, a 2 ½ ft by 7 ft doorway, and a mirrored closet door that
is 6 ft by 7 ft. What surface area must he paint?
3. Jennifer must make a conical funnel out of sheet metal. If the funnel is 9 inches tall,
has a slant height of 10.7 inches, and has a radius of 5.8 inches at the top, what is
the surface area of the sheet metal in square feet?
4. The wood that Terrance wants to use to make a shelving unit costs $6.49/ft2. How much
will it cost him (assuming no wastage) to make a shelving unit that is 4 ft wide by 12
inches deep by 5 ft tall if there are 4 shelves (plus the top and bottom)?