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Numerically Equal

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

I want to draw a square in which the perimeter is numerically equal to the area.

Red square.

Of course, the perimeter will be measured in units of length, for example, centimetres (cm) while the area will be measured in square units, for example, square centimetres (cm$^2$).

What size square will I need to draw?

What about drawing a rectangle that is twice as long as it is wide which still has a perimeter numerically equal to its area?
 


Can They Be Equal? offers a suitable extension to this problem.