The equation of a circle is $(x + 1)^{2} + (y - 4)^{2} = 16$ . What is its radius?

16

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4

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- 4

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- 16

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Solution

The correct option is A $4$
Compare the equation with the standard form with center at (h, k) and radius, r is: $(x - h)^{2} + (y - k)^{2} = r^{2}$
$(x + 1)^{2} + (y - 4)^{2} = 16$
So, $r^{2} = 16$
Taking root on both the sides, we get
$r = 4$

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