a conic section
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You could walk around it
The perimeter is the border or outer boundary around a two dimensional figure and is the length of such a boundary - a field for example, a perimeter fence
No, a rectangular pyramid has 8 edges. There are 4 around the base (the rectangle). Then, there are 4 others: one from each corner of the base (a rectangle has 4 corners) to the point of the pyramid.
No a cube is a 3d box with squares all around it.
Only one way to find out: measure the width and the length of the garden, add them together and multiply by two which gives the perimeter of the rectangular garden.