About This Chapter
2D & 3D Shapes - Chapter Summary
Feel confident that you have a good grasp of 2D and 3D shapes by exploring entertaining video lessons. This chapter explores the definitions of these shapes and offers examples you can use to ensure you understand their differences and how they are classified and constructed. After reviewing the lessons, you will be prepared to:
- Define and identify various 2D shapes
- Differentiate between 2D and 3D shapes
- Identify polygon shapes
- List and describe the five platonic solids
- Use sides and angles to classify triangles
- Demonstrate how to construct a triangle
Video lessons are presented in an engaging manner that makes getting reacquainted with 2D and 3D shapes fun and easy. With each video is a full transcript of the lesson you can print to take additional notes and highlight key concepts. To gauge your comprehension of polygons, platonic solids and more, take the multiple-choice quiz with each lesson. A chapter exam is also available to reinforce lesson concepts.
1. What are 2D Shapes? - Definition & Examples
In this lesson, you will find out how a flat piece of paper will help you determine what shapes are considered 2D. You will also learn the wide variety of 2D shapes you may encounter in life.
2. What are 3D Shapes? - Definition & Examples
What's the difference between 2D and 3D shapes? Learn the answer to this question in this lesson. You will also explore what makes spheres and cubes 3D shapes.
3. What Are Polygons? - Definition and Examples
Watch this video lesson to see how the shapes that you grew up with are all related. Learn why the shapes of bricks, stars, and street blocks are considered polygons while the sun, moon, and rolling hills are not.
4. What Are Platonic Solids? - Definition and Types
Watch this video lesson, and you will learn that there are only five platonic solids in the whole world. You will also learn what they look like and see real-life examples.
5. Classifying Triangles by Angles and Sides
Not all triangles are the same. There are equilateral, isosceles and scalene triangles. Then there are right, acute and obtuse triangles. In this lesson, we'll learn how to classify triangles using their sides and angles.
6. Constructing Triangles: Types of Geometric Construction
When you're asked to construct a triangle, it's time to break out that compass and straight edge! In this lesson, find out how to construct triangles no matter what you're given.
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