Florida B.E.S.T. MA.2.GR.1.3
The Standard
Identify line(s) of symmetry for a two-dimensional figure.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students find where a flat shape can be split into matching mirror halves. They identify all possible symmetry lines, including when a shape has none.
What Mastery Looks Like
- Students draw every symmetry line on familiar shapes, including vertical, horizontal, and diagonal lines. They verify each line by folding or comparing reflected halves.
Common Misconceptions
- Students may think any line through the center creates symmetry. They may miss diagonal lines or count lines that make equal areas but not mirror images.
How to Assess It
- Give students a rectangle, square, heart, and scalene triangle. Ask them to draw every symmetry line, then mark figures with none.
Lesson moves
Ways to Teach It
Give students paper shapes to fold, then have them trace each crease that makes two matching halves.
Show a shape with three possible lines and ask, “Which lines make mirror halves, and how can you prove it?”
Students sort shape cards by zero, one, two, or more symmetry lines, then check each choice with a small mirror.
Take a classroom photo hunt for symmetrical objects, then sketch each object and add its symmetry lines.
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Printable MA.2.GR.1.3 Worksheet
A ready-to-print activity worksheet aligned to MA.2.GR.1.3, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- MA.912.GR.2.4
Determine symmetries of reflection, symmetries of rotation and symmetries of translation of a geometric figure.
- MA.912.GR.4.1
Identify the shapes of two-dimensional cross-sections of three-dimensional figures.
- MA.2.GR.1
Identify and analyze two-dimensional figures and identify lines of symmetry.
- MA.3.GR.1.3
Draw line(s) of symmetry in a two-dimensional figure and identify line-symmetric two-dimensional figures.
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