The Doctor needs Clara to act as him now that he is trapped in a shrunken TARDIS. Clara takes advantage of this to call herself the Doctor.

Bill demonstrates how to measure the area of different rectangles and the volume of a cube. He explains what the area and volume mean: how much room the shape takes up.

Which one of the Monster Math Squad is medium?

Square One TV shows kids how to calculate area and perimeter. The couple must work out the area of their home so they may invite the correct number of guests to their party.

In this clip, two young men compare the sizes of three hypothetical candy bars to decide which to buy.