What is the image of a circle with equation (x+2)2+(y−2)2=1 when it is rotated through 6π about the origin?(a) (x+(3+1))2+(y−(3−1))2=1(b) (x−(3+1))2+(y+(3−1))2=1(c) (x+(3−1))2+(y−(3+1))2=1(d) (x−(3−1))2+(y+(3+1))2=1
Q. What is the image of a circle with equation (x+2)2+(y−2)2=1 when it is rotated through 6π about the origin?(a) (x+(3+1))2+(y−(3−1))2=1(b) (x−(3+1))2+(y+(3−1))2=1(c) (x+(3−1))2+(y−(3+1))2=1(d) (x−(3−1))2+(y+(3+1))2=1
Identify Center and Radius: Identify the original center of the circle and its radius from the given equation (x+2)2+(y−2)2=1. The center is (−2,2) and the radius is 1.
Calculate New Center Coordinates: Calculate the new coordinates of the center after rotation by π/6 radians. Use rotation matrix [cos(π/6)−sin(π/6)sin(π/6)cos(π/6)] to rotate the point (−2,2).
Compute New Coordinates: Compute cos(π/6)=3/2 and sin(π/6)=1/2. Apply these to the rotation matrix:New x=(−2)(3/2)−(2)(1/2)=−3−1,New y=(−2)(1/2)+(2)(3/2)=−1+3.
Write Equation of Circle: Write the equation of the circle with the new center and the same radius. The equation becomes: (x+(3+1))2+(y−(3−1))2=1.