The area of the rectangle is 12 cm 2. The area of a rectangle can also be calculated using the following formula. Calculate the area of the large rectangle. \(8 \times (4 + 4 + 4) = 8 \times 12 ...

The subject of a formula is the variable that is being worked out. It can be recognised as the letter on its own on one side of the equals sign. For example, in the formula for the area of a ...