Because all the vertices are already joined together.
The formula for the diagonals of a polygon is: 1/2*(n2-3n) where n is the number of sides
A triangle has 3 sides and 1/2*(32-9) = 0
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It is possible.
yes it is possible to do that.
It is impossible to have a triangle with 3 right angles. It is possible to draw a triangle with three right angles on the surface of a sphere: www.metacafe.com/watch/769025/270_degree_triangle_yes_3_right_angles
No
Yes!!