How does setting width and height to 0, with a border and border-radius, create a circle in CSS?

How does this CSS produce a circle?

This is the CSS:

div {</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">width: 0;
height: 0;
border: 180px solid red;
border-radius: 180px;

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}

Here is how it produces the circle below:

The width and height properties set the size of the content area of the div. In this case, the content area is 0 pixels wide and 0 pixels high, which means that it is invisible.

The border property sets the size and color of the border around the div. In this case, the border is 180 pixels wide and red.

The border-radius property sets the radius of the corners of the border. In this case, the border-radius is 180 pixels, which means that the corners of the border are rounded to a radius of 180 pixels.

The combination of the width, height, border, and border-radius properties creates the appearance of a circle. The content area is invisible, so only the border is visible. The border is round since the border-radius is 180 pixels, which gives the appearance of a circle.

Here is a diagram that illustrates how the CSS properties work to create the circle:

The inner circle represents the content area of the div. The outer circle represents the border of the div. The border-radius property rounds the corners of the outer circle, giving it the appearance of a circle.

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