We use scale factor when we talk about increasing the size of a 2D shape. The size by which we make the shape larger is described by its scale factor.
How do you find out the scale factor?
The basic formula that is used for calculating the scale factor is, Scale factor = Dimension of the new shape ÷ Dimension of the original shape. In case, if the original figure is scaled up, the formula is written as, Scale factor = Larger figure dimensions ÷ Smaller figure dimensions.