How many diagonals does a prism have whose base is a regular polygon with 3 sides?
http://intermath.coe.uga.edu/tweb/CPTM1/trushin/diagonals/diagonalsinapolygon.htm
To find the number of diagonals in a prism whose base is a regular polygon with 3 sides, we can use the following formula:
Number of diagonals = n * (n-3) / 2
In this formula, "n" represents the number of sides of the polygon.
Since the base of the prism is a regular polygon with 3 sides (a triangle), we substitute this value into the formula:
Number of diagonals = 3 * (3-3) / 2
= 0
Therefore, a prism with a base that is a regular polygon with 3 sides has zero diagonals.