triangle with right angle, base 1, height 2 different triangle with base 1 and height 2 third triangle with base 1 and height 2

All these triangles have a base of 1 unit and a height of 2 units.
What can you say about the areas of these triangles in the same family?
Can you generalise to other "families" of triangles?

You might like to use the interactivities below to explore your ideas.