There are two triangles in this picture, ABC and A'B'C'. Triangle ABC have 2 base and 2 height. Triangle A'B'C' have 6 base and 6 height, which is 3 times larger than ABC. When two objects have the same shape but different size, it is called similar.
A similar object can be made by using dilation transformation. In this case, ABC triangle have been dilated by 3 times to make A'B'C'
