3D Shapes Introduction — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A square is flat, but a cube is solid.
A cube is a solid 3D shape, while a square is just a flat 2D shape.
2. A circle is 2D, but a sphere is 3D.
A sphere is the 3D round shape that matches the flat 2D circle.
3. A triangle is 2D, but a cone is 3D and pointy.
Cones are 3D shapes with one circle base and a single pointy top.
4. A rectangle is 2D, but a cylinder is 3D.
Cylinders are 3D shapes formed by rolling a rectangle into a tube.
5. An orange is shaped like a sphere.
Oranges are spheres because they are round in every direction.
6. A book box can look like a cube.
Boxes with six equal square faces are cubes, useful for stacking.
7. An ice cream cone has a circle base and point.
Ice cream cones are perfect cone shapes with a point and circle base.
8. A water bottle is mostly a cylinder.
Water bottles are cylinders with circle tops, bottoms, and curved sides.
9. A flat shape on paper is called 2D.
2D means two dimensions, like flat circles, squares, and triangles.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Globe
→ Sphere
Sphere
Dice
→ Cube
Cube
Funnel
→ Cone
Cone
Crayon
→ Cylinder
Cylinder
Globes are spheres, dice are cubes, funnels are cones, crayons are cylinders.