It involves using two corresponding sides.

That's not quite right! You've got original and new the wrong way around. This would lead to an inverse scale factor.

The area of the larger shape is proportional to the length scale factor squared

Not quite! Remember that we need to multiply by the length scale factor **squared**, as we want to find the area.

Similarity means that shapes are proportional, and we can extend this idea to area as well.

Similar Shapes: Area

Similar Shapes

Congruency 1

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For each area there are several explanatory videos that cleverly go through the rules and examples. In addition, there is a function that gives the child tips if he gets stuck on a task.