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1/3/6/10/15/21/28/36/45/55/66/78/91 are the triangular numbers. Only 1 and 36 are also square.
The answer is no. A square pyramid can not have all triangle faces because the base of this particular pyramid would be a square.
its square numbers that's it lol its NUMBERS
yes because square numbers have to be hole numbers to be square
3
there are 360 in a square and 180 in a triangle