The sum of the squares of the lengths of the two shortest sides
is equal to the square of the longest side.
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A right angle triangle with two side lengths that match that of an equivalent square will have exactly half the area of the square.
The checking for right-angled triangles is RHS:Right angle - they both haver a right angleHypotenuse - the hypotenuse of the triangles are congruentSide - a corresponding side of the triangles are congruent.
It is the largest side
The hypotenuse is the side opposite to the right angle in the triangle.
A2+B2=C2A and B are the sides of a right triangle that aren't directly across the right angle. C is the hypotenuse. (This only applies to right triangles).Also, one that does pertain to all triangles is the well-known Law of Cosines, one used to develop the Pythagorean Theorem:c2 = a2 + b2 - abcos(A), where "c" is the hypotenuse, "b" is one side, "a" is another, and "A" is the angle on the opposite's side. (Between the opposite and the adjacent).