SAT Math Multiple Choice Question 303: Answer and Explanation

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Test Information

Question: 303

3.

The graph of the equation above is a circle. What is the area, in square units, of the circle?

  • A. 4π
  • B. 5π
  • C. 16π
  • D. 25π

Correct Answer: D

Explanation:

D

Difficulty: Easy

Category: Additional Topics in Math / Geometry

Strategic Advice: When the equation of a circle is written in the form (x - h)2 + (y - k)2 = r2, the point (h, k) represents the center of the circle on a coordinate plane, and r represents the length of the radius.

Getting to the Answer: To find the area of a circle, use the formula, A = πr2. In the equation given in the question, r 2 is the constant on the right-hand side (25)-you don't even need to solve for r because the area formula involves r 2, not r. So, the area is π(25) or 25π.

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