Not always.
a triangle with 2 sides
A right triangle.
yes it can, this is called a right triangle.
2, the two smallest sides are perpendicular to eachother.
A right angled triangle is an example of a shape with exactly 2 perpendicular sides.
Perpendicular means meeting at a right angle. A right triangle has 2 sides that are perpendicular, so it has 1 pair of sides that are perpendicular They are known as the "legs" of the right triangle.
That is impossible because it can only have 1 perpendicular line so if it has 2 it wouldn't be a triangle.
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.
a right scalene triangle
No but 2 of its 3 sides are equal in lengths.
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.