2, the two smallest sides are perpendicular to eachother.
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right angled triangle does not have all equal sides
Yes. If it is a right triangle, the angle opposite the hypotenuse will be right, 90o, therefore if the lines forming the angle were to continue, they would be perpendicular. What's the question?
An acute angled triangle, right angled triangle or obtuse angled triangle.
A right angle triangle has no parallel sides
A right angled triangle.