Perimeter is the distance around a polygon. Examples of Perimeter The perimeter of the rectangle shown is AB + BC + CD + DA = 8 + 5 + 8 + 5 = 26 units . Perimeter of a rectangle can also be found using the formula 2l+w, where l is the length and w is the width. ...
Geometries work.In 2011 in our high school geometry classes, we chasedtetrahedronsandoctahedrons, going within, smaller and smaller. From our classroom model to the Planck length there were just 112 base-2 steps bydividingthe edges by 2 and connecting the new vertices until we were about the s...