exterior angle的音標是[?k?st??r??(r) ???ɡl??]，基本翻譯是“外角”，速記技巧是“外角記作英文字母E”。

Exterior angle的英文詞源：

Exterior angle這個詞源自拉丁語詞根“exterior”，意為“外部的”。這個詞根可以引申為“與外部有關的”或“與內部無關的”。Angle是“角”的意思，所以exterior angle可以理解為“外部的角”，也就是圖形的外角。

變化形式：

在英語中，angle通常以單數形式出現，表示角。然而，當涉及到多邊形或三角形的外角時，它也可以以復數形式出現，如“external angles”。

相關單詞：

1. Interior angle：內角 - 與內部有關的角，與exterior angle相對。

2.supplementary angle：補角 - 兩個角的和為180度，通常用于描述兩個相補的角，也就是兩個外角。

3.obtuse angle：鈍角 - 角度大于90度的角，通常用于描述鈍角，也就是一個外角。

4.acute angle：銳角 - 角度小于90度的角，通常用于描述銳角，也就是一個內角。

5.straight angle：直角度 - 直角，即角度為90度的角。

6.angle sum：角度和 - 兩個角的和。

7.supplementary angles：補角度 - 兩個角的補角。

8.supplementary angles of a polygon：多邊形補角 - 多邊形的各個外角的補角。

9.supplementary angles of a triangle：三角形補角 - 三角形的三個外角的補角，等于180度。

10.angle measure：角度測量 - 用于測量角度的工具或方法。

以上這些單詞都與angle和exterior angle有關，描述了角的不同類型和測量方法。

常用短語：

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.