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Which Shapes Belong Together? is a free printable Grade 3 maths worksheet on shapes sharing a defining attribute, aligned to Common Core standard 3.G.A.1. It prints 5 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 3 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Which Shapes Belong Together?

3.G.A.1

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: rectangle, regular pentagon, rhombus, regular octagon

All sides equalSides not all equal
2.Sort each one into the right box.

Sort: trapezoid, rhombus, square, regular pentagon

All sides equalSides not all equal
3.Sort each one into the right box.

Sort: regular pentagon, trapezoid, rhombus, regular octagon

All sides equalSides not all equal
4.Sort each one into the right box.

Sort: equilateral triangle, trapezoid, regular octagon, square

All sides equalSides not all equal
5.Sort each one into the right box.

Sort: regular pentagon, equilateral triangle, regular octagon, trapezoid

All sides equalSides not all equal

LessonPrint · 3.G.A.1 · Set 3 · free to copy for classroom use

Answer key — Which Shapes Belong Together?

Set 3. Prints on its own sheet.

  1. 1.All sides equal: regular pentagon, rhombus, regular octagon; Sides not all equal: rectangle
  2. 2.All sides equal: rhombus, square, regular pentagon; Sides not all equal: trapezoid
  3. 3.All sides equal: regular pentagon, rhombus, regular octagon; Sides not all equal: trapezoid
  4. 4.All sides equal: equilateral triangle, regular octagon, square; Sides not all equal: trapezoid
  5. 5.All sides equal: regular pentagon, equilateral triangle, regular octagon; Sides not all equal: trapezoid

Last reviewed 2026-09-05. Aligned to 3.G.A.1 of the Common Core State Standards for mathematics.