Question a-circ
A circle in the xy-plane has equation . Which of the following points does NOT lie in the interior of the circle?
A circle in the xy -plane has equation . Which of the following points does NOT
Hard-difficulty · SAT Math · Circles — Equation of a circle in coordinate plane. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. The circle with equation has center
and radius 5. For a point to be inside of the circle, the distance from that point to the center must be less than the radius, 5. The distance between
and
is
, which is greater than 5. Therefore,
does NOT lie in the interior of the circle.
Choice A is incorrect. The distance between and
is
, which is less than 5, and therefore
lies in the interior of the circle. Choice B is incorrect because it is the center of the circle. Choice C is incorrect because the distance between
and
is
, which is less than 5, and therefore
in the interior of the circle.
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