2D and 3D Shapes — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which shapes can roll?
A) cube and rectangular prism
B) sphere and cylinder
C) triangle and square
D) cone and cube
Spheres and cylinders can roll because they have curved surfaces. Cubes and rectangular prisms cannot roll.
2. A soccer ball is most like which 3D shape?
A) cube
B) cylinder
C) sphere
D) cone
A soccer ball is round like a sphere — it has no flat faces, no edges, and no vertices.
3. Which shape has NO vertices and NO edges?
A) cone
B) cylinder
C) cube
D) sphere
A sphere has no vertices and no edges. It is completely round with only a curved surface.
4. How many vertices does a triangle have?
A) 2
B) 3
C) 4
D) 5
A triangle has 3 vertices (corners), one at each point where two sides meet.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A cube has 6 faces that are all squares.
A cube has 6 faces and every face is a square of equal size.
2. A cylinder has 2 flat circular faces and 1 curved surface.
A cylinder has 2 flat circular faces (top and bottom) and 1 curved surface around the side.
3. A rectangular prism has 8 vertices.
A rectangular prism has 8 vertices — 4 on top and 4 on the bottom.
4. A 2D shape is flat while a 3D shape is solid.
2D shapes are flat — they have only length and width. 3D shapes are solid — they also have depth.
5. An octagon has 8 sides.
An octagon has 8 sides. The prefix 'oct' means eight.