Question x-4-2-
The graph of the given equation is a circle in the xy-plane. The point lies on the circle. Which of the following is a possible value for ?
x + 4 2 + y - 19 2 = 121 The graph of the given
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 B is correct. An equation of the form , where , , and are constants, represents a circle in the xy-plane with center and radius . Therefore, the circle represented by the given equation has center and radius . Since the center of the circle has an x-coordinate of and the radius of the circle is , the least possible x-coordinate for any point on the circle is , or . Similarly, the greatest possible x-coordinate for any point on the circle is , or . Therefore, if the point lies on the circle, it must be true that . Of the given choices, only satisfies this inequality.
Choice A is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.
More Circles practice questions
- A circle has a radius of 43 meters. What is the area, in square
- The center of the circle is point upper O. Points upper S, upper R,
- A circle has center G , and points M and N lie on the
- A circle has a radius of 2.1 inches. The area of the circle is
- In the xy -plane, a circle has center C with coordinates h , k
- A circle has a circumference of 31 π centimeters. What is the diameter, in
- The equation above defines a circle in the xy -plane. What are the coordinates
- The circle above with center O has a circumference of 36. What is the
Browse all Additional Topics in Math practice questions or return to the full SAT question bank.
