9.3用顶点和光线识别角度
Section outline
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Donyell walks from his house to his school. Then, after school he walks to his friend's house. He notices that his journey forms an angle . He decides to name the angle. Donyell labels his house as point , his school as point and his friend's house as point . Can you use the points to name of the angle formed by his journey?
::Donyell从他家走到他的学校,然后放学后走到他朋友家,他注意到他的旅程形成一个角度,他决定给角度命名,Donyell将他的家标为H点,将他的学校标为S点,将他朋友家标为F点。你能用这些点来命名他的旅程形成的角度吗?In this concept, you will learn about the parts of an angle.
::在这个概念中,你会了解角度的部位。Identifying Angles by Vertex and Ray
::通过 Vertex 和 Ray 识别角An angle is one of the key geometric figures that you will be working with in geometry. An angle is created when two rays connect at a common point.
::一个角度是您在几何学中要使用的关键几何数字之一。 当两个射线在一个共同点连接时, 一个角度会被创建 。You can see that the two rays are connected at a common endpoint , called a vertex . This forms the angle. An angle is named by points on the rays.
::您可以看到两个射线连接在一个共同的端点上,称为顶点。它形成角度。一个角度由射线上的点点命名。Let's look at an example of an angle.
::让我们看看一个角度的例子。This is angle . The vertex is always in the middle. The symbol for angle looks like a small angle.
::这是角度 A B C 。 顶点 B 总是在中间。 角的符号看起来像小角度 。
::* A B CAngle is named with this symbol.
::角度 A B C 以此符号命名 。Examples
::实例Example 1
::例1Earlier, you were given a problem about Donyell and his walk to school and then to his friend's house.
::早些时候,你遇到了一个问题 关于唐耶尔 和他的步行上学,然后他的朋友的房子。Name the angle if his house is point , his school is point and his friend's house is point .
::若他家是H点, 他的学校是S点, 他朋友家是F点,First, determine the common endpoint.
::首先,确定共同的终点。
::S S 级Then, name the angle.
::然后,请说出角度。
::* HH S FThe answer is .
::答案是"H S F"Example 2
::例2What is the common endpoint of the rays that form ?
::形成“H I J”的射线的常见端点是什么?First, determine the name of the common endpoint.
::首先,确定共同终点的名称。The vertex
::顶点Next, identify the location of the vertex in the angle name.
::下一步,在角度名称中指定顶点的位置。The middle point
::中点Then, write the point.
::那么写点。
::一一The answer is . The common endpoint of the rays that form is .
::答案是我。光线中常见的终点就是我。Example 3
::例3Name this angle. Be sure that the vertex is in the middle.
::命名此角度。 请确定顶点在中间 。First, locate the common endpoint.
::首先,找到共同的终点。
::英 英 英Then, name the angle.
::然后,请说出角度。
::____________________________________________________________________________________________________________________________________________The answer is .
::答案是“D E F”。Example 4
::例4First, locate the common endpoint.
::首先,找到共同的终点。
::M 男Then, name the angle.
::然后,请说出角度。
::* L M NThe answer is
::答案是"L M N"Example 5
::例5What is the common endpoint of the rays that form ?
::构成QR S的射线的常见端点是什么?First, determine the name of the common endpoint.
::首先,确定共同终点的名称。The vertex
::顶点Next, identify the location of the vertex in the angle name.
::下一步,在角度名称中指定顶点的位置。The middle point
::中点Then, write the point.
::那么写点。
::R RThe answer is . The common endpoint of the rays that form is .
::答案是R。构成QR S的射线的共同终点是R。Review
::回顾Draw a picture to illustrate each of the named geometric figures.
::绘制图片以说明每个命名的几何数字。-
::A B ______________________________________________________________________________________________________________________________________________________________________________________ -
::C D __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ -
::D E ______________________________________________________________________________________________________________________________________________________________________________________________________________________ -
::* A B C -
::* L M N -
::# 你 # # X Y # -
::PQ____________________________________________________________________________________________________________________________________ -
::G H _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ -
::A B D E -
::L M D E -
::R S -
::# 达芙 # * X Y #
Define the following terms.
::界定以下术语。-
Ray
::雷 -
Line
::线线线 -
Vertex
::顶点 -
Line Segment
::行线段段
Review (Answers)
::回顾(答复)
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