how to create circle that cut off one piece with css - html

Question

I want create one circle with CSS that cut off one piece (like pizza :D) but I don't know about it. please guide me how to create one circle like pizza that one piece cut off.
this is my code :
HTML:
<div class="state"></div>
CSS:
.state {
position: absolute;
height: 44px;
width: 44px;
right: 5px;
top: 0;
border: 3px solid transparent;
border-radius: 25px;
z-index: 1;
border-color: #82ba00
}
I want create this image :

Answer 1

Using the link RJo provided and the demo in one of the answers I came up with this:
<div class="arc-wrapper">
<div class="arc arc_start"></div>
<div class="arc arc_end"></div>
</div>
.arc-wrapper {
position:relative;
margin:20px;
}
.arc {
position:absolute;
top:0;
left:0;
width: 100px;
height: 100px;
border-radius:100%;
border:1px solid;
border: 10px solid;
border-color: #82ba00;
}
.arc_start {
border-color:#82ba00 transparent;
-webkit-transform: rotate(-65deg);
-moz-transform: rotate(-65deg);
-ms-transform: rotate(-65deg);
-o-transform: rotate(-65deg);
transform: rotate(-65deg);
}
.arc_end {
border-color: transparent #82ba00 #82ba00 #82ba00;
-webkit-transform: rotate(-110deg);
-moz-transform: rotate(-110deg);
-ms-transform: rotate(-110deg);
-o-transform: rotate(-110deg);
transform: rotate(-110deg);
}
You can change the size and direction of the gap by changing the rotate(deg) values.
Demo: http://jsfiddle.net/mmetsalu/JmruQ/

Answer 2

Here is the solution.
Working Fiddle
Inspiration from magnifying glass shape from this LINK
EDIT: This is a adjustable arc too. So you can increase or decrease size of the circle only by making one change to this line in the CSS
font-size: 15em; /* This controls the size. */
CSS
#pie {
font-size: 15em;
/* This controls the size. */
display: inline-block;
width: 0.5em;
height: 0.5em;
border: 0.05em solid #00cc00;
position: relative;
border-radius: 0.35em;
}
#pie::before {
content:"";
display: inline-block;
position: absolute;
right: 0.33em;
bottom: 0em;
border-width: 0;
background: white;
width: 0.22em;
height: 0.12em;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
}
HTML
<div id="pie"><div>
EDIT 2:
Here is a fiddle of a Canvas based solution. Personally i feel you should use this method.
FIDDLE
Code borrowed from Tharindulucky

Answer 3

See this fiddle: http://jsfiddle.net/avrahamcool/vqu5d/
HTML:
<div id="circle"></div>
CSS:
#circle {
width: 50px;
height: 50px;
border-radius: 50%;
border: 10px solid green;
border-bottom-color: transparent;
transform:rotate(30deg);
}

Answer 4

You can easily do it by using HTML5 Canvas element.
First write the code for cavas. (Just like a div.)
<canvas id="myCanvas" width="200" height="100" style="border: 1px solid black;"></canvas>
And then write the script for it
<script>
var d=document.getElementById("myCanvas");
var dtx=d.getContext("2d");
dtx.beginPath();
dtx.arc(95,50,40,0,1.8*Math.PI);
dtx.lineWidth = 5;
dtx.stroke();
</script>
It will produce what you want. Have fun!
For more advanced reference, http://www.html5canvastutorials.com/tutorials/html5-canvas-circles/