Mr. Wizard explains the fourth dimension: time. He mentions that length, width, and height are the three dimensions we're familiar with and that time is another dimension.
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.
Square One TV shows kids how to calculate area using a problem. Red Harry wants to make a statement with his artwork, but needs to figure out the dimensions of his art frame.