The best replacement for perimeter is area.

The best alternatives to perimeter are rated as following:
★★★★★  area
★★★★★  parameter
★★★  circumference
★  rotational defense volleyball
★  area of a rectangle
  rotation defense volleyball
  area of square
  area worksheet
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  circumference of a circle
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  perimeter
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  units
  square feet
  square units

Your alternative for perimeter is not listed? Suggest!
Speaking about perimeter, one probably shouldn't forget about geoboards.

Other search terms related to perimeter and their ratings are:
★★★★★ geoboards
★ only the area
★ missing side
width
You have in mind a companion for perimeter and it is not yet here? Propose!



Google Trends

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perimeter
area
parameter