2D vs 3D Shapes

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Answer Key & Explanations

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

1. Emma is looking at her orange juice carton. The carton is shaped like a box that she can hold in her hand. Is the juice carton a 2D shape or a 3D shape? Answer: 3D shape Solution: A 2D shape is flat, like a square drawn on a piece of paper. You cannot hold it because it is just a drawing. A 3D shape is solid and takes up space.
   Full step-by-step solution

   Step 1: A 2D shape is flat, like a square drawn on a piece of paper. You cannot hold it because it is just a drawing. Step 2: A 3D shape is solid and takes up space. You can pick it up, hold it, and look at it from all sides. Step 3: Emma's juice carton is a real object she can hold in her hand. It is not flat like a drawing. Step 4: Therefore, the juice carton is a 3D shape. Final answer: 3D shape

2. Which shape has 6 flat faces that are all squares? Answer: B. Cube Solution: A cube has 6 flat faces that are all squares A cylinder has 2 flat circular faces and 1 curved surface The correct answer is Cube.
   Full step-by-step solution

   Step 1: A sphere has no flat faces - it is round all over Step 2: A pyramid has triangular faces and a square base Step 3: A cube has 6 flat faces that are all squares Step 4: A cylinder has 2 flat circular faces and 1 curved surface The correct answer is Cube.

3. Noah is holding a dice in his hand. Is the dice a 2D shape or a 3D shape? Answer: 3D shape Solution: A 2D shape is flat, like a square drawn on a piece of paper. You cannot hold it up because it has no thickness. Step 2: A 3D shape is solid and takes up space.
   Full step-by-step solution

   Step 1: A 2D shape is flat, like a square drawn on a piece of paper. You cannot hold it up because it has no thickness. Step 2: A 3D shape is solid and takes up space. A dice is a real object you can pick up, turn around, and roll. Step 3: Noah's dice is a solid object he can hold in his hand, so it is a 3D shape. The correct answer is 3D shape.

4. Emma is sorting shapes from her toy box. She puts all the shapes with flat faces in one pile and all the shapes that can roll in another pile. Which shape should go in the rolling pile? Answer: C. Sphere Solution: A cube has 6 flat square faces and cannot roll A sphere has a completely curved surface and can roll easily A pyramid has flat triangular faces and a square base, so it cannot roll A rectangular prism has 6 flat rectangular faces and cannot roll The correct answer is Sphere because a sphere can…
   Full step-by-step solution

   Step 1: A cube has 6 flat square faces and cannot roll Step 2: A sphere has a completely curved surface and can roll easily Step 3: A pyramid has flat triangular faces and a square base, so it cannot roll Step 4: A rectangular prism has 6 flat rectangular faces and cannot roll The correct answer is Sphere because a sphere can roll.

5. Which shape is flat like a piece of paper? Answer: A. Triangle Solution: A cube is a 3D shape with length, width, and height. A triangle is a flat, 2D shape. A sphere is a round, 3D shape like a ball.
   Full step-by-step solution

   Step 1: A cube is a 3D shape with length, width, and height. Step 2: A triangle is a flat, 2D shape. Step 3: A sphere is a round, 3D shape like a ball. Step 4: A cone is a 3D shape with a circular base and a pointed top. The correct answer is Triangle.

6. A square has 4 corners. A triangle has 3 corners. How many corners do a square and a triangle have together? Answer: D. 7 Solution: A square has 4 corners. A triangle has 3 corners. Add the corners together: 4 + 3 = 7.
   Full step-by-step solution

   Step 1: A square has 4 corners. Step 2: A triangle has 3 corners. Step 3: Add the corners together: 4 + 3 = 7. The correct answer is 7.