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The perimeter is the whole outside edge or border of an area or shape - you can walk around the perimeter of a park, or put a fence around the perimeter of a building. In math class, it's the total length you get by adding up all the sides of a shape.
周長；周邊
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
perimeternoun/pɪˈɹɪm.ɪ.tə/
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mathematicssciencesThe sum of the distance of all the lengths of the sides of an object.
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mathematicssciencesThe length of such a boundary.
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The outer limits of an area.
- In 1977, Papa Wemba decided to change the name of his housing tract, in the outskirts of Kinshasa, to Village Molokai,² of which he declared himself traditional chief. Then, within this perimeter, he advocated a clothing style that featured, among its distinctions, a beret, and that went along with a way of walking, talking, and behaving toward others.
- Assuming her daughter had gone inside to escape the rain, she asked the store clerk if Jo-Anne was waiting inside. The clerk answered that she was no longer there. Visibly panicked, both split up and began scouring the parking lot and the building’s perimeter. They checked behind the store, trash bins, and around the payphone booth, yelling Jo-Anne’s name into the rain.
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A fortified strip or boundary usually protecting a military position.
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An instrument for determining the extent and shape of the field of vision.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。