Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

What is the image of a circle with equation (x+2)2+(y2)2=1(x + 2)^2 + (y - 2)^2 = 1 when it is rotated through π6\frac{\pi}{6} about the origin?\newline(a) (x+(3+1))2+(y(31))2=1(x + (\sqrt{3} + 1))^2 + (y - (\sqrt{3} - 1))^2 = 1\newline(b) (x(3+1))2+(y+(31))2=1(x - (\sqrt{3} + 1))^2 + (y + (\sqrt{3} - 1))^2 = 1\newline(c) (x+(31))2+(y(3+1))2=1(x + (\sqrt{3} - 1))^2 + (y - (\sqrt{3} + 1))^2 = 1\newline(d) (x(31))2+(y+(3+1))2=1(x - (\sqrt{3} - 1))^2 + (y + (\sqrt{3} + 1))^2 = 1

Full solution

Q. What is the image of a circle with equation (x+2)2+(y2)2=1(x + 2)^2 + (y - 2)^2 = 1 when it is rotated through π6\frac{\pi}{6} about the origin?\newline(a) (x+(3+1))2+(y(31))2=1(x + (\sqrt{3} + 1))^2 + (y - (\sqrt{3} - 1))^2 = 1\newline(b) (x(3+1))2+(y+(31))2=1(x - (\sqrt{3} + 1))^2 + (y + (\sqrt{3} - 1))^2 = 1\newline(c) (x+(31))2+(y(3+1))2=1(x + (\sqrt{3} - 1))^2 + (y - (\sqrt{3} + 1))^2 = 1\newline(d) (x(31))2+(y+(3+1))2=1(x - (\sqrt{3} - 1))^2 + (y + (\sqrt{3} + 1))^2 = 1
  1. Identify Center and Radius: Identify the original center of the circle and its radius from the given equation (x+2)2+(y2)2=1(x + 2)^2 + (y - 2)^2 = 1. The center is (2,2)(-2, 2) and the radius is 11.
  2. Calculate New Center Coordinates: Calculate the new coordinates of the center after rotation by π/6\pi/6 radians. Use rotation matrix [cos(π/6)sin(π/6) sin(π/6)cos(π/6)]\begin{bmatrix} \cos(\pi/6) & -\sin(\pi/6) \ \sin(\pi/6) & \cos(\pi/6) \end{bmatrix} to rotate the point (2,2)(-2, 2).
  3. Compute New Coordinates: Compute cos(π/6)=3/2\cos(\pi/6) = \sqrt{3}/2 and sin(π/6)=1/2\sin(\pi/6) = 1/2. Apply these to the rotation matrix:\newlineNew x=(2)(3/2)(2)(1/2)=31x = (-2)(\sqrt{3}/2) - (2)(1/2) = -\sqrt{3} - 1,\newlineNew y=(2)(1/2)+(2)(3/2)=1+3y = (-2)(1/2) + (2)(\sqrt{3}/2) = -1 + \sqrt{3}.
  4. Write Equation of Circle: Write the equation of the circle with the new center and the same radius. The equation becomes: \newline(x+(3+1))2+(y(31))2=1(x + (\sqrt{3} + 1))^2 + (y - (\sqrt{3} - 1))^2 = 1.

More problems from Reflections of functions