you can use pythagorean theroum. a squared plus b squared equal c squared (a^2+b^2=c^2) where a and b are the short and long sides and c is the hypotnuse
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Well, when the slopes of the perpendicular sides of the right triangle are mutiplied, the result should be -1.
Pick three numbers. If the square of the largest number is equal to the sum of the squares of the other two, then the three numbers could represent the sides of a right triangle.
Unless it is a right isosceles triangle, a normal right triangle has no pairs of equal sides.
If all 3 sides are equal: Equilateral Triangle If 2 sides are equal: Isosceles Triangle If all 3 sides are unequal/different: Scalene Triangle
It is the right angle triangle which has 3 sides whereas all quadrilaterals have 4 sides.