Still need more practice? You can go to these links for additional practice:
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/e/symmetry-of-two-dimensional-shapes
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/e/rotational-symmetry-of-2d-shapes
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/v/reflecting-across-two-lines
You may also find these video links helpful:
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/v/axis-of-symmetry
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/v/example-rotating-polygons
https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-transformation-properties-and-proofs/hs-geo-symmetry/v/constructing-quad-based-on-symmetry