If it contains a 90 degree angle and two acute angles that add up to 90 degrees then it is a right angle triangle.
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yes, two sides are perpendicular and the side lengths fit the pythagrean theorum
A shape with three sides is called a triangle: 3 equal sides = equilateral 2 sides same length = isosceles 1 right angle = right-angled triangle
A shape with one corner is a triangle. Yes, I know, technically it has three sides, but it only has one corner. So, there you have it, a triangle is the shape you're looking for.
Use either the Sine or Cosine rules depending on the information you know about the triangle.
It could possibly be a triangle depending on its base
the opposite (i know kinda obvious)Improved Answer:-The hypotenuse