OAS 6.GM.1.3 (Oklahoma, 6th Grade): "Identify and describe the line(s) of symmetry in two-dimensional shapes." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.
Geometry & Measurement (GM)6.GM.1 Use translations, reflections, and rotations to establish congruence and understand symmetry (not on a coordinate plane).6.GM.1.3Identify and describe the line(s) of symmetry in two-dimensional shapes.