Identifying 2D & 3D Shapes & Attributes — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which 3D shape has 6 faces, 12 edges, and 8 vertices?
A) Sphere
B) Cone
C) Cube
D) Cylinder
C) Cube is correct because every cube has exactly 6 square faces, 12 edges where the faces meet, and 8 sharp corners. These three numbers together describe a cube perfectly.
2. How many edges does a sphere have?
A) 1
B) 2
C) 4
D) 0
D) 0 is correct because edges are straight lines where faces meet, and a sphere is all curved with no faces. Without faces, there are no edges to count.
3. Which 2D shape has no straight sides?
A) Triangle
B) Square
C) Circle
D) Rectangle
C) Circle is the only 2D shape here made of one smooth curve with no straight sides. Squares, triangles, and rectangles all have straight sides that you can draw with a ruler.
4. A cone has 1 vertex and how many flat faces?
A) 0
B) 1
C) 2
D) 3
B) 1 flat face is correct because a cone has only its round circle base as a flat face, while the rest of the shape is the curved part that leads to the point.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A cube has 8 vertices and 12 edges.
A cube has 12 edges: 4 around the top face, 4 around the bottom face, and 4 vertical lines joining them. Each edge is where two flat square faces meet.
2. A cylinder has 1 curved surface and 2 flat circles.
A cylinder is the shape described because it has a curved side that wraps around and two flat round circle faces, one on top and one on the bottom. Think of a can of beans.
3. A 2D shape has length and width but no depth.
A 2D shape has no depth, which is why it is flat and fits on a piece of paper. Only 3D shapes have depth, letting them take up space in the real world.
4. A cone has 1 curved surface.
A cone has 1 curved surface that wraps around from the circle base up to the pointy top vertex. It is the smooth part that is not flat like a face.
5. The flat surfaces on a 3D shape are called faces.
Faces are the flat sides of a 3D shape, like the 6 squares on a cube. If a surface is curved, we do not call it a face.