If you can find a squared and add it to b squared you will get csquared.

When you double the dimensions the scale factor is 2. The perimeter got 2 times bigger and the area got 4 times bigger because you have to double the length and width. When you triple the dimensions the scale factor is 3. The perimeter got 3 times bigger and the area got 9 times bigger because you have to triple the length and width.