Two shapes are said to be similar if they are exactly the same shape, but are different in size.
Scaling all the lengths of the original shape can create a similar shape. This means they have been enlarged or shortened in the same proportions. We call this the scale factor.
Which of the following shapes are similar?
A and F are similar cubes: as the length, width and height are equal all cubes are similar.
B and G are similar circles: all circles are similar.
C and H are similar arrows: H is twice as big as C and has been rotated by 90°.
D and E are not similar: D has been stretched by scale factor 2 in one direction, but not the other.