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a^2 + b^2 = c^2 c= hypotenuse a and b are the legs (sides) of the triangle
There is no formal definition: it is any side of a triangle. Often, if the triangle has a horizontal base, then it is one of the sloped sides. In a right angled triangle, it is one of sides adjacent to the right angle. In an isosceles triangle, it is one of the equal sides.
A triangle with a right angle and different lengths for sides is a right, scalene triangle.
A right angled triangle.
if two sides are of equal length, the a triangle is said to be isoceles.