The line $y = mx + c$ will be a normal to the circle with radius $r$ and centre at $(a, b)$, if
The line $y = mx + c$ will be a normal to the circle with radius $r$ and centre at $(a, b)$, if
- A
$a = mb + c$
- B
$b = ma + c$
- C
$r = ma - b + c$
- D
$r = ma - b$
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