Georgia 4.GSR.8.2
The Standard
Classify, compare, and contrast polygons based on lines of symmetry, the presence or absence of parallel or perpendicular line segments, or the presence or absence of angles of a specified size and based on side lengths.
Georgia's K-12 Mathematics Standards · Identify and draw geometric objects, classify polygons based on properties, and solve problems involving area and perimeter of rectangular figures.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students examine polygons and identify side lengths, angle types, parallel or perpendicular sides, and lines of symmetry. They use those features to sort shapes and explain similarities and differences.
What Mastery Looks Like
- Given a mixed set of polygons, students sort them correctly and explain each choice using side, angle, line, and symmetry properties. They recognize that one shape can fit more than one polygon group.
Common Misconceptions
- Students may think a turned shape changes its name or that a square is not a rectangle. They may confuse parallel sides with equal sides, or count a diagonal as a symmetry line without checking the fold.
How to Assess It
- Exit ticket: Show a square and a non-square rectangle. Students list their shared properties, one difference, and every line of symmetry.
Lesson moves
Ways to Teach It
Give pairs of students craft sticks and angle tiles to build polygons, then record equal sides, right angles, parallel sides, and symmetry.
Display a square and ask, “Which polygon names fit it, and what visible properties prove each name?”
Play polygon clue bingo: call properties such as one line of symmetry or no right angles, and students cover matching shape cards.
Have students inspect floor tiles, signs, and tabletops, sketch one polygon, and label its parallel sides, right angles, and symmetry lines.
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Printable 4.GSR.8.2 Worksheet
A ready-to-print activity worksheet aligned to 4.GSR.8.2, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 5.GSR.8.1
Classify, compare, and contrast polygons based on properties.
- 3.GSR.6.2
Classify, compare, and contrast polygons, with a focus on quadrilaterals, based on properties. Analyze specific 3-dimensional figures to identify and describe q...
- 3.GSR.6.3
Identify lines of symmetry in polygons.
- 3.GSR.6
Identify the attributes of polygons, including parallel segments, perpendicular segments, right angles, and symmetry.
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