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JEE MAIN 2021
25-02-21 S1
Question
If the curves, $\frac{x^2}{a}+\frac{y^2}{b}=1$ and $\frac{x^2}{c}+\frac{y^2}{d}=1$ intersect each other at an angle of $90^{\circ}$, then which of the following relations is TRUE?
Select the correct option:
A
a + b = c + d
B
a – b = c – d
C
a – c = b + b
D
$a b=\frac{c+d}{a+b}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
For orthogonal curves a – c = b – d
a – b = c – d
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