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3. Given a sphere with diameter 12 cm, find the surface area of the smallest cylinder containing the sphere.

4. A rectangular box has sides of length 4 cm, 10 cm and 12 cm. What are the lengths of each of the four diagonals of the box?

5. A room measures 4 m by 7 m and the ceiling is 3 m high. A litre of paint covers 20 square metres. How many litres of paint will it take to paint all but the floor of the room?

6. Find the dimensions of the smallest possible cubical box to hold a sphere of radius r. What percent of the volume will be air (percent nearest)?

7. The interior angles of an n-gon have an average measure of 175 degrees. Calculate n.