This could be a sign of a stroke or some other type of nerve damage. See a doctor immediately, especially if you are experiencing dizzyness, difficulty concentrating or pain.
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right side!
You did not give the height of the pyramid and 16 cm is not an area, but the area of the face would be one half the face height of the side of the pyramid times the length of the base side.
Possibly a face - or an edge. It would help if the question was properly phrased.
If side refers to 'face', then the pyramid would be a quadrilateral pyramid with 8 edges. If side refers to the base of the pyramid, it would be a pentagonal pyramid with 10 edges.
the side which is to be used for the outside