Multiple choice

Directions: The following question contains statement - 1 (Assertion), statement - 2 (Reason), 4 choices (A), (B), (C) and (D) out of which only one is correct. Tangents are drawn from the point (17, 7) to the circle x2 + y2 = 169 Statement - 1 The tangents are mutually perpendicular. Because Statement - 2 The locus of the points from which mutually perpendicular tangents can be drawn to the given circle is x2 + y2 = 338.

  1. Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for statement - 1

  2. Statement - 1 is True, Statement - 2 is True; Statement - 2 is Not a correct explanation for statement - 1

  3. Statement - 1 is True, Statement - 2 is False

  4. Statement - 1 is False, Statement - 2 is True

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The locus of points from which mutually perpendicular tangents can be drawn to a circle x^2 + y^2 = r^2 is the director circle x^2 + y^2 = 2r^2. Here r^2 = 169, so 2r^2 = 338. Since (17, 7) satisfies x^2 + y^2 = 17^2 + 7^2 = 289 + 49 = 338, the tangents are indeed perpendicular.

AI explanation

The given circle equation is x squared plus y squared equals 169, giving a radius of 13; the locus of points from which mutually perpendicular tangents can be drawn to a circle is its director circle, whose equation is x squared plus y squared equals 2 times r squared. Substituting the radius gives the director circle equation as x squared plus y squared equals 338, which matches statement 2 and proves it is true. Since the point (17, 7) yields 17 squared plus 7 squared equal to 289 plus 49, which is 338, the point lies on the director circle; therefore, the tangents drawn from it are mutually perpendicular, making statement 1 true, and statement 2 is a correct explanation for statement 1.