2D and 3D Shapes — Answer Key
Part A: Multiple Choice
Circle the letter of the best answer.
1. Which 3D shape has NO flat faces at all?
A) Cube
B) Cylinder
C) Sphere
D) Cone
C is correct because a sphere is completely round and has no flat faces, edges, or vertices.
2. How many vertices does a rectangular prism have?
A) 4
B) 6
C) 8
D) 12
C is correct because a rectangular prism has 8 vertices, which are the corner points where three edges meet.
3. Which 2D shape has the most sides?
A) Pentagon
B) Rectangle
C) Hexagon
D) Trapezoid
C is correct because a hexagon has 6 sides, more than a pentagon (5), rectangle (4), or trapezoid (4).
4. A shape has 1 flat circle face and 1 point. What is it?
A) Cylinder
B) Sphere
C) Cone
D) Cube
C is correct because a cone has 1 flat circular face at the base and 1 point (vertex) at the top.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A cube has 8 more edges than a rectangle has sides.
A cube has 12 edges and a rectangle has 4 sides, so 12 minus 4 equals 8 more.
2. A cylinder has 0 edges and 0 vertices.
A cylinder has 0 edges and 0 vertices because its surfaces are curved, not straight.
3. Both a square and a rectangle have 4 sides, but only a square has 4 equal sides.
A rectangle has 4 sides like a square, but its sides are not all equal — it has 2 long sides and 2 short sides.
4. A hexagon has 2 more sides than a square.
A hexagon has 6 sides and a square has 4 sides, so 6 minus 4 equals 2 more sides.
5. A rectangular prism has 12 edges and 8 vertices.
A rectangular prism has 12 edges where faces meet and 8 vertices at the corners.