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Which Shapes Belong Together? is a free printable Grade 3 math 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 students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 20 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: equilateral triangle, regular octagon, rhombus, trapezoid

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

Sort: square, regular octagon, scalene triangle, kite

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

Sort: scalene triangle, square, trapezoid, rectangle

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

Sort: equilateral triangle, kite, regular octagon, scalene triangle

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

Sort: kite, scalene triangle, trapezoid, equilateral triangle

All sides equalSides not all equal

LessonPrint · 3.G.A.1 · Set 20 · free to copy for classroom use

Answer key — Which Shapes Belong Together?

Set 20. Prints on its own sheet.

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

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