A metric.
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Perimeter isn't an unit of measure, it's another name for "outside edge", or "boundary"
The length is one dimension. You can measure it along one edge of the floor. The width is another dimension. You can measure it along another edge of the floor. The height is the third dimension. You can measure it in the corner where two walls meet.
meter
another name for a septagon is a heptagon
Another name is its correct name: an isosceles triangle.