1.

In a \[\Delta ABC\], if\[\angle B={{90}^{o}}\], then ________

A. \[A{{B}^{2}}=A{{C}^{2}}+B{{C}^{2}}\]  
B. \[A{{C}^{2}}=A{{B}^{2}}+B{{C}^{2}}\]
C. \[B{{C}^{2}}=A{{B}^{2}}+B{{C}^{2}}\]  
D.  All of these
Answer» C. \[B{{C}^{2}}=A{{B}^{2}}+B{{C}^{2}}\]  


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