与美国小学生一起学英文第7册 第26期:八边形

 　　Octagon 八边形

　　What is a shape that has 5 lines and 5 angles¹? 哪种形状有五条边和五个角？

　　It is a pentagon. 它就是五边形。

　　What is a shape that has 8 lines and angles? 哪种形状有八条边和八个角呢？

　　It is an octagon. 它就是八边形。

　　"Oct" means "eight" and "gon" means "shape". “Oct”是“八”的意思，“gon”是“形状”的意思。

　　Do you know what all the angles of an octagon add up to? 你知道八边形的内角和是多少吗？

　　They add up to 1080 degrees. 它的内角和为1080度。

　　A regular octagon has 8 lines all of the same length and all 8 angels are equal. 正八边形的八条边和八个角都相等。

　　Where can you find octagon shape of things? 你在哪里能找到八边形的物体？

　　How about your ball-pens or pencils? 圆珠笔或铅笔怎么样啊？

　　They are all octagons. 它们都是八边形。

　　Also, umbrellas and stop signs are octagons. 伞和停车标记也是八边形。

1 angles   

n.角( angle的名词复数 )；[比喻]（考虑、问题的）角度；观点；轮廓鲜明的突出体

参考例句：

• She angles her reports to suit the people she is speaking to. 她带着一定的倾向性作报告以迎合她的听众。 来自《简明英汉词典》
• Angles of less than 90 degrees are called acute angles. 小于90度的角叫锐角。 来自《简明英汉词典》