JSXGraph
JSXGraph share

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Würzelprümpf
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<iframe 
    src="https://jsxgraph.org/share/iframe/wrzelprmpf" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Würzelprümpf" 
    allowfullscreen
></iframe>
This code has to 
<button onClick="alert('hi');">Say Hi!</button>

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    and the autor Wigand Rathmann (https://en.www.math.fau.de/rathmann/)
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-4, 2, 6, -4], keepaspectratio: true });
    var p1 = board.create('point', [0, 0], { name: 'X', size: 4 });
    var p2 = board.create('point', [2, -1], { name: 'B', size: 4 });
    var p3 = board.create('point', [-2, -3], { name: 'C', size: 4 });
    var p4 = board.create('point', [-1, -1], { name: 'D', size: 4 });
    var p5 = board.create('point', [3, 1], { name: 'E', size: 4 });
    
    var poly = board.create('polygon', [p1, p2, p3, p4, p5], { borders: { strokeColor: 'black' } });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
and the autor Wigand Rathmann (https://en.www.math.fau.de/rathmann/)
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-4, 2, 6, -4], keepaspectratio: true });
var p1 = board.create('point', [0, 0], { name: 'X', size: 4 });
var p2 = board.create('point', [2, -1], { name: 'B', size: 4 });
var p3 = board.create('point', [-2, -3], { name: 'C', size: 4 });
var p4 = board.create('point', [-1, -1], { name: 'D', size: 4 });
var p5 = board.create('point', [3, 1], { name: 'E', size: 4 });

var poly = board.create('polygon', [p1, p2, p3, p4, p5], { borders: { strokeColor: 'black' } });
test test $\frac{4}{5}$ $$\frac{2}{3}$$ **AI generated desctiption**
Have also a look at the examples
Web references
Special thanks to the author Wigand Rathmann. 
<button onClick="alert('hi');">Say Hi!</button>
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-4, 2, 6, -4], keepaspectratio: true });
var p1 = board.create('point', [0, 0], { name: 'X', size: 4 });
var p2 = board.create('point', [2, -1], { name: 'B', size: 4 });
var p3 = board.create('point', [-2, -3], { name: 'C', size: 4 });
var p4 = board.create('point', [-1, -1], { name: 'D', size: 4 });
var p5 = board.create('point', [3, 1], { name: 'E', size: 4 });

var poly = board.create('polygon', [p1, p2, p3, p4, p5], { borders: { strokeColor: 'black' } });

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology
and the author Wigand Rathmann in the credits.