**2D and 3D Shape Review Worksheet**

### Introduction

Understanding 2D and 3D shapes is a fundamental concept in mathematics, particularly in geometry. In this review worksheet, we will revisit the basics of 2D and 3D shapes, including their definitions, properties, and real-world applications.

### 2D Shapes

#### Definition

A 2D shape, also known as a two-dimensional shape, is a shape that has length and width but no thickness. 2D shapes can be drawn on a piece of paper and can be measured using units such as centimeters or inches.

#### Types of 2D Shapes

There are several types of 2D shapes, including:

**Quadrilaterals**

**Rectangle**: A quadrilateral with opposite sides of equal length, where all internal angles are right angles (90 degrees).**Square**: A quadrilateral with opposite sides of equal length, where all internal angles are right angles (90 degrees) and all sides are of equal length.**Rhombus**: A quadrilateral with opposite sides of equal length, where opposite angles are equal.**Trapezoid**: A quadrilateral with one pair of opposite sides of equal length.

**Triangles**

**Equilateral Triangle**: A triangle with all sides of equal length.**Isosceles Triangle**: A triangle with two sides of equal length.**Scalene Triangle**: A triangle with all sides of different lengths.

**Circles and Other Shapes**

**Circle**: A set of points equidistant from a central point called the center.**Oval**: An ellipse with a symmetrical shape.**Heart Shape**: A shape resembling the human heart.

### 3D Shapes

#### Definition

A 3D shape, also known as a three-dimensional shape, is a shape that has length, width, and thickness. 3D shapes occupy space and can be measured using units such as cubic centimeters or cubic inches.

#### Types of 3D Shapes

There are several types of 3D shapes, including:

**Prisms**

**Cube**: A prism with all sides of equal length, where all internal angles are right angles (90 degrees).**Rectangular Prism**: A prism with opposite sides of equal length, where all internal angles are right angles (90 degrees).**Triangular Prism**: A prism with a triangular base.

**Pyramids**

**Square Pyramid**: A pyramid with a square base.**Triangular Pyramid**: A pyramid with a triangular base.

**Cones and Cylinders**

**Cone**: A 3D shape with a circular base and a curved surface that tapers to a point.**Cylinder**: A 3D shape with two parallel and circular bases connected by a curved surface.

**Real-World Applications**

2D and 3D shapes are used in various real-world applications, including:

**Architecture**: Buildings, bridges, and monuments are designed using 2D and 3D shapes.**Engineering**: Engineers use 2D and 3D shapes to design machines, mechanisms, and structures.**Art and Design**: Artists and designers use 2D and 3D shapes to create visual compositions and designs.

### Conclusion

In conclusion, understanding 2D and 3D shapes is essential in mathematics and has numerous real-world applications. This review worksheet has covered the basics of 2D and 3D shapes, including their definitions, properties, and types. By mastering these concepts, you will be able to apply them to various problems and situations in mathematics and real-life scenarios.