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# A hyperbola whose asymptotes includes a right angle is said to be

$\begin{array}{1 1}(a)\;\text{Conjugate hyperbola}\\(b)\;\text{Rectangular hyperbola}\\(c)\;\text{Foci of hyperbola}\\(d)\;\text{None of these}\end{array}$

A hyperbola whose asymptotes includes a right angle is said to be rectangular hyperbola
Hence (b) is the correct answer.