JavaScript formula for finding the area of ​​a trapezoid

Trapezoid is one of the basic shapes we learn mathematics. It consists of two parallel bases and four sides between them. The formula for finding the area of ​​a trapezoid is also a very basic mathematical knowledge. In this article, we'll cover how to write a trapezoid area formula using JavaScript.

Find the formula for the area of ​​a trapezoid

First, let’s take a look at the formula for the area of ​​a trapezoid:

S ​​= (a b) × h / 2

Where, S represents the area of ​​the trapezoid, a and b represent the lengths of the two bases of the trapezoid, and h represents the height of the trapezoid.

JavaScript code implementation

Now let’s take a look at how to use JavaScript to implement the trapezoid area formula.

We can calculate the area of ​​the trapezoid by prompting the user to enter the length and height of the base of the trapezoid. The following is the implementation code:

// 提示用户输入梯形的底边长度和高度
var a = parseFloat(prompt("请输入梯形的上底长度："));
var b = parseFloat(prompt("请输入梯形的下底长度："));
var h = parseFloat(prompt("请输入梯形的高度："));

// 计算梯形的面积
var S = (a + b) * h / 2;

// 显示梯形的面积
document.write("梯形的面积为：" + S);

In this code, we first use the prompt() function in JavaScript to prompt the user to enter the upper and lower length, lower base length and height of the trapezoid, and then assign these values ​​to Variables a, b and h.

Next, we use the trapezoid area formula to calculate the area of ​​the trapezoid and store the calculation result in the variable S.

Finally, we use the document.write() function in JavaScript to output the area of ​​the trapezoid to the web page.

Test code

In order to verify whether our code is correct, we can enter some different test data for testing. For example, we can input the upper base length 5, the lower base length 10 and the height 8, then the program will output the following results:

The area of ​​the trapezoid is: 60

Conclusion

This article introduces how to write the trapezoid area formula using JavaScript and details the implementation process through code examples. In actual development, if you need to calculate the area of ​​a trapezoid, please use this simple JavaScript code.

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