<P> Pythagorean triples can likewise be encoded into a matrix of the form </P> <Dl> <Dd> X = (c + b a a c − b). (\ displaystyle X = (\ begin (bmatrix) c + b&a \ \ a&c - b \ end (bmatrix)).) </Dd> </Dl> <Dd> X = (c + b a a c − b). (\ displaystyle X = (\ begin (bmatrix) c + b&a \ \ a&c - b \ end (bmatrix)).) </Dd> <P> A matrix of this form is symmetric . Furthermore, the determinant of X is </P>

Chapter 9 two special types of right triangles