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This article mainly introduces the relevant knowledge of how to find the perimeter of a circle in javascript, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this javascript article on how to find a circle. Let's take a look at it.

In javascript, you can use the PI property of the Math object to find the circumference of a circle, which returns the ratio of the circumference of a circle to its diameter (that is, the ratio of pi); the syntax for finding the circumference of a circle is the radius of a Math.PI*2* circle.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

In javascript, you can use the PI property of the Math object to find the perimeter of a circle.

The PI attribute is π, that is, the ratio of the circumference of a circle to its diameter, that is, pi. This value is approximately 3.14.

Example:

Given that the radius of a circle is 2, what is the circumference of the circle?

Calculation code:

Var circumference=Math.PI*2*r;console.log ("the circumference of a circle with radius 2 is:" + circumference)

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