The area of each square is 1 cm 2. There are 12 squares contained in this rectangle. The area of the rectangle is 12 cm 2. The area of a rectangle can also be calculated using the following formula.

What is the area of this shape, if the area of each grid square is 1 cm 2? There are 10 squares contained in this shape. The area of the shape is 10 cm 2. The area of each square is 1 cm 2.

Many of the set squares in the mathematics collection are early modern treasures handcrafted in Europe. A particularly interesting example has a then-new metric scale. (See also the scale rules group ...