exterior angle

exterior angle的音标是[ɪkˈstɪərɪə(r) ˈæŋɡlɪə]，基本翻译是“外角”，速记技巧是“外角记作英文字母E”。

Exterior angle的英文词源：

Exterior angle这个词源自拉丁语词根“exterior”，意为“外部的”。这个词根可以引申为“与外部有关的”或“与内部无关的”。Angle是“角”的意思，所以exterior angle可以理解为“外部的角”，也就是图形的外角。

变化形式：

在英语中，angle通常以单数形式出现，表示角。然而，当涉及到多边形或三角形的外角时，它也可以以复数形式出现，如“external angles”。

相关单词：

1. Interior angle：内角 - 与内部有关的角，与exterior angle相对。

2.supplementary angle：补角 - 两个角的和为180度，通常用于描述两个相补的角，也就是两个外角。

3.obtuse angle：钝角 - 角度大于90度的角，通常用于描述钝角，也就是一个外角。

4.acute angle：锐角 - 角度小于90度的角，通常用于描述锐角，也就是一个内角。

5.straight angle：直角度 - 直角，即角度为90度的角。

6.angle sum：角度和 - 两个角的和。

7.supplementary angles：补角度 - 两个角的补角。

8.supplementary angles of a polygon：多边形补角 - 多边形的各个外角的补角。

9.supplementary angles of a triangle：三角形补角 - 三角形的三个外角的补角，等于180度。

10.angle measure：角度测量 - 用于测量角度的工具或方法。

以上这些单词都与angle和exterior angle有关，描述了角的不同类型和测量方法。

常用短语：

1. exterior angle of a triangle

2. exterior angle of a polygon

3. exterior angle of a rectangle

4. exterior angle of a square

5. exterior angles of a circle

6. exterior angles of a sphere

7. exterior angles of a cone

例句：

1. The exterior angles of the triangle are equal to each other.

2. The exterior angles of the square are equal to each other.

3. The exterior angles of the pentagon are greater than 180 degrees.

4. The exterior angles of the cylinder are equal to each other.

5. The exterior angles of the hexagon are equal to each other and sum up to 360 degrees.

6. The exterior angles of the rectangle are equal to the sum of the interior angles.

7. The exterior angles of the pentagram are equal to each other and sum up to 540 degrees.

英文小作文：

The exterior angles of a polygon are an essential part of geometry, and they help us understand how shapes fit together and how they relate to each other. When we look at a polygon, we see that its exterior angles are all different, but they all add up to 360 degrees. This is because every angle in a polygon is adjacent to two other angles, and these two angles add up to 180 degrees, which leaves the third angle with 180 degrees less, which is 180 degrees minus one angle. This means that every angle in a polygon is equal to the sum of its adjacent angles, which is why we call them exterior angles.

In this way, exterior angles help us understand how shapes fit together and how they relate to each other, and they help us understand the geometry of polygons and how they work in real life.