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    ::[图1]

    Monica pulls into a parking lot and sees a blue sign. She quickly recognizes the sign as a  polygon , but she can't remember the exact name of the polygon. She stares at the sign for a few seconds then asks her younger sister to identify the shape. What type of polygon should her younger sister use to describe the sign?
    ::Monica拉到停车场看到一个蓝色的标志。 她很快认出这个标志是一个多边形, 但她记不得这个多边形的确切名称。 她盯着这个标志看几秒钟, 然后叫她的妹妹去辨认形状。 她的妹妹应该用什么类型的多边形来描述这个标志?

    In this concept, you will learn to classify polygons.

    ::在此概念中,您将学会对多边形进行分类。

    Classifying Polygons
    ::分类多边形

    polygon  is a simple closed figure formed by three or more segments. A  triangle  is a polygon and a  quadrilateral  is a polygon, too. Here are three pictures of polygons.
    ::多边形是指由三个或三个以上区块构成的简单封闭的图形。三角形是一个多边形,四边形也是一个多边形。这里有三幅多边形图象。

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    There are several different types of polygons.
    ::有几种不同的多边形。

    Here is a list of the first eight types of polygons. 
    ::这是前八种多边形的列表 。

    1. triangle  has three sides.
      ::三角形有三边

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    1. quadrilateral  has four sides.
      ::四方有四面。

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    1. pentagon  has five sides.
      ::五角形有五面

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    1. hexagon  has six sides.
      ::六边形有六面形

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    1. heptagon  has seven sides
      ::七十七方有七面

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    1. An  octagon  has eight sides.
      ::八角形有八边

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    1. nonagon  has nine sides.
      ::一个非阿贡有九面。

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    1. decagon  has ten sides.
      ::十角形有十边

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    Examples
    ::实例

    Example 1
    ::例1

    Earlier, you were given a problem about Monica and the parking sign.
    ::早些时候,有人给你一个问题 关于莫妮卡和停车牌。

    She knows that the sign is a polygon, but she can't remember the name. She asks her younger sister. What type of polygon should her younger sister use to describe the shape of the sign?
    ::她知道这个标志是一个多边形, 但她不记得这个名字。 她问她妹妹。 她妹妹应该用什么样的多边形来描述这个标志的形状?

    First, count the number of sides.
    ::首先,计数双方的数目。

    4

    Then, classify the polygon.
    ::然后对多边形进行分类。

    Quadrilateral
    ::四方

    The answer is a quadrilateral. Her younger sister should describe the shape of the sign as a quadrilateral.
    ::答案是四边形。她的妹妹应该把标志的形状描述为四边形。

    Example 2
    ::例2

    Classify the polygon that is represented in the picture.
    ::分类图片中所代表的多边形。

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    First, count the number of sides for the television. Do not count the stand.
    ::首先, 计数电视的边数。 不要计数证人席 。

    4

    Then, classify the polygon.
    ::然后对多边形进行分类。

    Quadrilateral
    ::四方

    The answer is that the television is shaped like a quadrilateral.
    ::答案是电视的形状像四边形

    Example 3
    ::例3

    Classify the polygon that is represented in the picture. 
    ::分类图片中所代表的多边形。

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    First, count the number of sides.
    ::首先,计数双方的数目。

    8

    Then, classify the polygon.
    ::然后对多边形进行分类。

    Octagon
    ::八角

    The answer is that a Stop sign is shaped like an octagon.
    ::答案是停止标志的形状像八角形

    Example 4
    ::例4

    Classify the polygon that is represented in the picture.
    ::分类图片中所代表的多边形。

     

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    First, count the number of sides.
    ::首先,计数双方的数目。

    5

    Then, classify the polygon.
    ::然后对多边形进行分类。

    5

    The answer is that the Pentagon is shaped like a pentagon.
    ::答案是五角大楼的形状像五角大楼

    Example 5
    ::例5

    Classify the polygon that is represented in the picture.
    ::分类图片中所代表的多边形。

     

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    First, count the number of sides for one of the shapes.
    ::首先,计算一个形状的边数 。

    6

    Then, classify the polygon.
    ::然后对多边形进行分类。

    Hexagon
    ::六边形

    The answer is a hexagon.

    ::答案是六边形

    Review
    ::回顾

    Determine whether or not each image is a polygon. If yes, write polygon, if no, explain why not.
    ::确定每个图像是否是一个多边形。 如果是,请写入多边形,如果不是,请解释为什么不是。

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    3. lesson content

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    4. lesson content

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    5. lesson content

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    6. lesson content

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      ::[图21]
    8. A square tile on a floor
      ::地板上的平方瓷砖

    Review (Answers) 
    ::回顾(答复)

    Click   to see the answer key or go to the Table of Contents and click on the Answer Key under the 'Other Versions' option.
    ::单击可查看答题键, 或转到目录中, 单击“ 其他版本” 选项下的答题键 。

    Resources
    ::资源