2D and 3D Shapes — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each shape into the correct category.
Flat Shape (2D)
squaretrianglerectangle Solid Shape (3D)
cubespherecylinder 2D shapes are flat and have only length and width. 3D shapes are solid and have length, width, and height.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A square has 4 sides.
A square has 4 equal sides and 4 corners.
2. A shape with no flat faces is a sphere.
A sphere has no flat faces — it is completely curved, like a ball.
3. A triangle has 3 vertices.
A triangle has 3 vertices (corners), one at each point where two sides meet.
4. A cube has 6 faces.
A cube has 6 flat square faces — top, bottom, front, back, left, and right.
5. A shape with 0 sides and 0 corners is a circle.
A circle is a 2D shape with no straight sides and no corners.
Part C: True or False?
Read each statement. Circle True or False.
1. A cube has 6 faces.
True False
True — A cube has 6 square faces.
2. A circle has 4 sides.
True False
False — A circle has 0 sides. It is a curved shape with no straight edges.
3. A triangle has 3 vertices.
True False
True — A triangle has 3 vertices (corners).
4. A cylinder is a flat shape.
True False
False — A cylinder is a 3D (solid) shape, not a flat shape. It has height and depth.