Yes. I think they're in the 3rd diagonal of the triangle. Basically, its how many numbers you need to make a geometrically correct triangle: 1, 3, 6, 10......
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You find the volume of a triangular prism by using this formula: Volume = 1/2 base of the triangle x height of the triangle x height of the prism.
It is impossible to find the area of a triangle with no height, if the triangle had no height it would not even be a triangle, just a angle.
surface area of triangle times the width/height of container.
Well, a triangle isn't a circle, so you cant find the circumference of it.
triangular numbers are created when all numbers are added for example: To find the 5 triangular number (1+2+3+4+5).