perimeter   2 videos

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  Perimeter

  Geometry Geometry Building Blocks

  How to define perimeter and calculate it for squares, rectangles, and circles.

  perimeter of a square rectangle and circle
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  Area of Regular Polygons

  Geometry Area

  How to derive the formula to calculate the area of a regular polygon.

  area apothem side hexagon isosceles triangle perimeter equilateral equiangular