Comparing 2-D and 3-D shapes · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Comparing flat and solid shapes

Mathematics · Geometry · ages 5-6
Name ______________________   Date ____________

  1. What do we call a place where two sides of a flat shape meet?

    • A straight side
    • A flat face
    • A curved part
    • A corner

  2. How many straight sides does a circle have?

    Answer: ______________

  3. Count the straight sides of this triangle.

    • 2
    • 3
    • 4

  4. A cube has flat square faces.

    Circle one:   True   False

  5. You turn a rectangle upside down. What happens to its side and corner counts?

    • Both counts stay at 4.
    • Both counts change to 3.
    • It has 5 sides and 4 corners.
    • It has 4 sides and 5 corners.

  6. Count this triangle's straight sides and corners separately. How do the two counts compare?

    • The counts match.
    • More sides than corners.
    • More corners than sides.

  7. How many corners does the whole cube have?

    Answer: ______________

  8. A card covers part of a rectangle. You see 3 corners. How many of the rectangle's corners are hidden?

    Answer: ______________

  9. Mia counts a triangle's top corner, its two other corners, then the top corner again. She says 4. How can she check?

    • Count each corner once and stop at the start.
    • Count the top corner twice before stopping there.
    • Count only two corners and leave out the top corner.

  10. A flat shape has four corners, so it must be a square.

    Circle one:   True   False

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Answer key

For grown-ups. Fold this page away before handing over the rest.

Comparing flat and solid shapes W1-mt_yGv8doDAmp-s1

  1. A corner · Two sides meet at a corner.
  2. 0 · A circle has no straight sides.
  3. 3 · The triangle has three straight sides.
  4. True · Each flat face of a cube is a square.
  5. Both counts stay at 4. · Turning adds or removes no sides or corners. Both counts stay at four.
  6. The counts match. · The triangle has three straight sides and three corners. The two counts match.
  7. 8 · Four top corners and four bottom corners make eight.
  8. 1 · A rectangle has four corners. Three show, so one is hidden.
  9. Count each corner once and stop at the start. · The starting corner was counted twice. Counting each corner once gives three.
  10. False · A rectangle that is not square also has four corners. Counting corners alone does not show that a shape is a square.
Worksheet · LightMySky