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3... If its a traingle it has 3 angles where the sides meet.
None.A triangle (not traingle) has 3 vertices (not vetices).
3 traingle
A scalene triangle has 3 different side lengths and 3 different interior acute angles that add up to 180 degrees
If it is an equilateral, for example if one side was 3 then you times the 3 by 3 because there are 3 equal sides. However, if it's not an equilateral you have to add them all up.