MAFS.4.G.1.3: Recognize a line of symmetry for a two-dimensional figure as a line
across the figure such that the figure can be folded along the line
into matching parts. Identify line-symmetric figures and draw lines of
symmetry.

Belongs to:
Draw and identify lines and angles, and classify shapes by properties of their lines and angles. (Additional Cluster)

Remarks/Examples:

Clarification 1: Instruction includes using properties of operations accurately and efficiently.

Clarification 2: Instruction includes linear expressions in any form with rational coefficients.