2D and 3D Shapes — Answer Key
Part A: Multiple Choice
Circle the letter of the best answer.
1. Which is NOT a property of a rectangle?
A) 4 sides
B) 4 corners
C) All sides are equal
D) 2 long sides and 2 short sides
C is correct because a rectangle does not need all sides to be equal — it has 2 long sides and 2 short sides. Only a square has 4 equal sides.
2. How many edges does a rectangular prism have?
A) 6
B) 8
C) 12
D) 10
C is correct because a rectangular prism has 12 edges where its faces meet.
3. Which 3D shape has exactly 2 flat faces?
A) Cone
B) Cube
C) Cylinder
D) Sphere
C is correct because a cylinder has exactly 2 flat circular faces, one on top and one on the bottom.
4. A shape has 6 faces, 8 vertices, and 12 edges. What is it?
A) Cone
B) Cylinder
C) Sphere
D) Cube
D is correct because a cube has 6 faces, 8 vertices, and 12 edges.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A cube and a rectangular prism both have 6 faces.
Both a cube and a rectangular prism have 6 faces.
2. A 2D shape with 3 sides and 3 corners is a triangle.
A triangle is defined as a 2D shape with exactly 3 sides and 3 corners.
3. A sphere has 0 flat faces, 0 edges, and 0 vertices.
A sphere is completely round with 0 flat faces, 0 edges, and 0 vertices.
4. A pentagon has 2 more corners than a triangle.
A pentagon has 5 corners and a triangle has 3 corners, so 5 minus 3 equals 2 more corners.
5. A cone has 1 flat face and 1 vertex.
A cone has 1 flat circular face at its base and 1 vertex at the point on top.