2D vs 3D Shapes

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Answer Key & Explanations

2D vs 3D Shapes · Grade 1 · Worksheet 2

1. Which shape is flat and has 6 sides? Answer: C. Hexagon Solution: A cube is a 3D shape with 6 faces, but it's not flat A sphere is a 3D shape with no flat sides A hexagon is a flat shape with exactly 6 sides A pyramid is a 3D shape with triangular faces The correct answer is Hexagon.
   Full step-by-step solution

   Step 1: A cube is a 3D shape with 6 faces, but it's not flat Step 2: A sphere is a 3D shape with no flat sides Step 3: A hexagon is a flat shape with exactly 6 sides Step 4: A pyramid is a 3D shape with triangular faces The correct answer is Hexagon.

2. Which shape can you stack like a can of soup? Answer: C. Cylinder Solution: A cylinder has a round base and can be stacked like cans The correct answer is Cylinder.
   Full step-by-step solution

   Step 1: A triangle is flat and cannot be stacked Step 2: A square is flat and cannot be stacked Step 3: A cylinder has a round base and can be stacked like cans Step 4: A circle is flat and cannot be stacked The correct answer is Cylinder.

3. Matiu has a shape that is flat like a piece of paper. It has four sides that are all the same length and four corners. Is this shape 2D or 3D? Answer: 2D Solution: A 2D shape is flat and can be drawn on paper. A 3D shape is solid and takes up space. Step 2: Matiu's shape is flat like a piece of paper, so it is not solid.
   Full step-by-step solution

   Step 1: A 2D shape is flat and can be drawn on paper. A 3D shape is solid and takes up space. Step 2: Matiu's shape is flat like a piece of paper, so it is not solid. Step 3: The shape has four sides and four corners, which describes a square. A square is a flat shape. Step 4: Therefore, the shape is a 2D shape. The correct answer is 2D.

4. Emma is sorting shapes into two boxes. One box is for flat shapes like squares and circles. The other box is for solid shapes like cubes and spheres. Which of these shapes should go in the solid shapes box? Answer: B. Cone Solution: A triangle is a flat shape with 3 sides - it goes in the flat shapes box A rectangle is a flat shape with 4 sides - it goes in the flat shapes box A cone is a solid shape that you can hold in your hand - it goes in the solid shapes box A circle is a flat shape with no sides - it goes in the flat…
   Full step-by-step solution

   Step 1: A triangle is a flat shape with 3 sides - it goes in the flat shapes box Step 2: A rectangle is a flat shape with 4 sides - it goes in the flat shapes box Step 3: A cone is a solid shape that you can hold in your hand - it goes in the solid shapes box Step 4: A circle is a flat shape with no sides - it goes in the flat shapes box The correct answer is Cone.

5. Which shape is flat and has 4 equal sides? Answer: B. Square Solution: A cube is a 3D shape, not a flat one. A square is a flat, 2D shape with 4 sides that are all equal. A sphere is a round 3D shape with no flat sides.
   Full step-by-step solution

   Step 1: A cube is a 3D shape, not a flat one. Step 2: A square is a flat, 2D shape with 4 sides that are all equal. Step 3: A sphere is a round 3D shape with no flat sides. Step 4: A pyramid is a 3D shape with a square base and triangular sides. The correct answer is Square, a square.