Understanding Area with Unit Squares | 用单位正方形理解面积

📚 Understanding Area with Unit Squares | 用单位正方形理解面积

Area is a measure of how much space a flat shape covers. When you place a book on a desk, the part of the desk hidden by the book is the book’s area. We use small unit squares to measure area, just as we use a ruler to measure length. In this lesson, we will learn what area is, how to count unit squares to find area, and how to use the formula for the area of a rectangle.

面积是衡量平面图形所占空间大小的量。把一本书放在课桌上，桌面被书挡住的部分就是这本书的面积。我们用小单位正方形来测量面积，就像用尺子测量长度一样。在这一课中，我们将学习什么是面积、如何数单位正方形来求面积，以及如何运用长方形的面积公式。

1. What Is Area? | 什么是面积？

Every flat shape has an area. The area is the amount of space inside the shape. Think of a basketball court: the whole painted floor that the players run on is the area of the court. The larger the shape, the larger the area it has.

每个平面图形都有面积。面积就是图形内部所占的空间大小。想一想篮球场：球员在上面跑动的整个油漆地面就是球场的面积。图形越大，它的面积就越大。

We measure area in square units. A square unit is a square with sides that are each 1 unit long. If the unit is 1 centimetre, we call one of these squares 1 square centimetre, or 1 cm². If the unit is 1 metre, we call it 1 square metre, or 1 m².

我们使用平方单位来测量面积。一个平方单位是边长各为1个单位的正方形。如果单位是1厘米，我们就把这样一个正方形称为1平方厘米，记作1 cm²。如果单位是1米，就称为1平方米，记作1 m²。

2. Why Do We Measure Area? | 为什么需要测量面积？

Knowing area helps us in daily life. A shopkeeper who sells carpet needs to know the area of a room to tell a customer how much carpet to buy. A painter needs the area of a wall to estimate how much paint is needed. A farmer needs the area of a field to decide how many seeds to plant.

了解面积在日常生活中很有用。卖

Published by TutorHao | IGCSE Mathematics Revision Series | aleveler.com

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