If the curves x2/a + y2/b = 1 and x2/c + y2/d = 1 intersect at right a – McqOptions

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1.	If the curves x²/a + y²/b = 1 and x²/c + y²/d = 1 intersect at right angles, then which one is the correct relation?
A.	b a = c d
B.	a + b = c + d
C.	a b = c d
D.	a b = c + d
Answer» D. a b = c + d

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