yes it can, this is called a right triangle.
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2, the two smallest sides are perpendicular to eachother.
That is impossible because it can only have 1 perpendicular line so if it has 2 it wouldn't be a triangle.
No triangle can have parallel sides but a right angle triangle has perpendicular sides that meet at 90 degrees
The 2 perpendicular sides of a right angle triangle intersect each other at right angles
No but it does have 3 sides 2 of which are of equal lengths.