It is a chart giving the distance between places.
You have a table with a list of places forming row and columns. The cell where the two intersect gives the distance between the two. Since the distance from A to B is the same as the distance from B to A, only half the square needs to be filled in - hence the triangle.
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triangular pyramid
The Nth triangular number is calculated by: N(N + 1) -------- 2 Hope this is useful!
a triangular pyramid has 4 triangular sides
There are four faces in a triangular pyramid.
a triangular prism!