Identifying 2D & 3D Shapes & Attributes — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which shape has 2 flat faces and 0 vertices?
A) Cone
B) Cube
C) Cylinder
D) Sphere
C) Cylinder is correct because it has 2 round flat faces (top and bottom) and no sharp corners anywhere. The curved side gives it smooth rolling ends instead of vertices.
2. How many vertices does a cone have?
A) 0
B) 1
C) 2
D) 3
B) 1 is correct because a cone comes to a single pointed tip at the top, which counts as its one vertex. The round bottom has no corners.
3. Which 2D shape has 4 sides and 4 right angles but sides are not all equal?
A) Square
B) Triangle
C) Rectangle
D) Circle
C) Rectangle is correct because it has 4 square corners but 2 long sides and 2 short sides, so the sides are not all equal. A square also has 4 right angles, but all its sides match.
4. A cube and a rectangular box both have how many faces?
A) 4
B) 5
C) 6
D) 8
C) 6 is correct because both a cube and a rectangular box have a top, a bottom, and four side faces, which add up to 6. They are called the same family of shapes for this reason.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A sphere has 0 vertices and 0 edges.
A sphere has 0 vertices because it is completely round with no sharp corners anywhere. Vertices only form where edges meet, and a sphere has no edges either.
2. A triangle is a 2D shape with 3 straight sides.
A triangle fits because its name starts with "tri," meaning three, and it is a flat shape with exactly 3 straight sides. No other 2D shape here has only 3 sides.
3. A cube has 6 faces that are all squares.
The flat surfaces on a cube are called faces, and a cube has 6 of them, each one a square. This is what makes the cube look the same no matter which side is up.
4. A cylinder has 2 edges and 0 vertices.
A cylinder has 0 vertices because its edges are circles, not straight lines, so they never meet at a pointy corner. Without meeting points, there are no vertices.
5. A corner on a 3D shape is called a vertex.
The special math word for a corner on a 3D shape is "vertex." Each vertex is a single point where three or more edges come together, like a corner of a cube.