### How Big?

If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?

### Possible extension

Mixing More Paints invites students to find a strategy for making any ratio.

### Possible support

Students could use different coloured counters or multilink cubes to represent the cans of paint, being sure to use the same total for each can of paint, or use diagrams by shading squares on squared paper.