In triangle ABC, ∠C = 90° and CD is the perpendicular from C to AB. If (CD)-2 = (BC)-2 + (CA)-2, then which one of the following is correct?

In triangle ABC, ∠C = 90° and CD is the perpendicular from C to AB.

1.	In triangle ABC, ∠C = 90° and CD is the perpendicular from C to AB. If (CD)-2 = (BC)-2 + (CA)-2, then which one of the following is correct?
A.	BC.CD = AB.CA
B.	AB.BC = CD.CA
C.	CA2 + CB2 = 2(AD2 + CD2)
D.	AB.CD = BC.CA
Answer» E.

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In triangle ABC, ∠C = 90° and CD is the perpendicular from C to AB. If (CD)-2 = (BC)-2 + (CA)-2, then which one of the following is correct?

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