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3rd grade · Math · Unit 10 of 14

Sorting Polygons

Triangles, quadrilaterals, pentagons, hexagons and octagons, regular and irregular.

What your child practices

Practices naming polygons by their number of sides and sorting them as regular (all sides and angles equal) or irregular.

Alabama Course of Study content standard: 3.26 · describing triangles, quadrilaterals and other polygons by their sides and angles

How we explain it

Children can open this short lesson before they practice.

  1. A polygon is a closed shape with straight sides.
  2. Triangle 3 sides, quadrilateral 4, pentagon 5, hexagon 6, octagon 8.
  3. A polygon has as many corners as sides.

Example: How many sides does a hexagon have? Hexa- means 6. A hexagon has 6 sides. Answer: 6

Sorting Polygons in Alabama

In the Alabama Course of Study, this is unit 10 of 14 in 3rd grade Math, after Area & Perimeter and before Times Tens.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Alabama State Department of Education (ALSDE)

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A square is a type of…

    • quadrilateral
    • triangle
    • pentagon

  2. Question 2

    How many sides does a pentagon have?

    • 6
    • 8
    • 5

  3. Question 3

    A polygon is a closed shape with…

    • only curved sides
    • straight sides
    • no sides

  4. Question 4

    A rectangle that is 3 cm wide and 6 cm long is…

    • regular
    • not a quadrilateral
    • irregular

  5. Question 5

    How many sides does a hexagon have?

    • 8
    • 6
    • 5

  6. Question 6

    A shape has 8 equal sides and 8 equal angles. It is a…

    • regular hexagon
    • irregular octagon
    • regular octagon

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