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Polygon II (Polygon transformations)
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<iframe 
    src="https://jsxgraph.org/share/iframe/polygon-ii-polygon-transformations" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Polygon II (Polygon transformations)" 
    allowfullscreen
></iframe>
This code has to 
<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
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-3, 3, 3, -3], keepaspectratio: true });
    var p1 = board.create('point', [-1, -1]);
    
    var c1 = board.create('circle', [p1, 3], { strokeOpacity: 0.1 });                                                          // 
    var p2 = board.create('glider', [2, -1, c1]);                                                                                      // p2 glides on circle c1
    
    var rot = board.create('transform', [function() { return Math.PI / 4; }, p1], { type: 'rotate' });         // rot is defined by the angle BAC
    var p3 = board.create('point', [p2, rot], { fixed: true, size: 1, name: 'h1' });                                    // h1: B rotated around A with angle rot
    var line = board.create('line', [p1, p3], { strokeOpacity: 0.1 });                                                      // line through A and h1
    
    var p4 = board.create('glider', [0, 0.5, line], { fixed: true });                                                          // C is on the line with a fixed distance from A
    var poly = board.create('polygon', [p1, p2, p4], { fillOpacity: 0.05 });
 </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
in the credits.
*/

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

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-3, 3, 3, -3], keepaspectratio: true });
var p1 = board.create('point', [-1, -1]);

var c1 = board.create('circle', [p1, 3], { strokeOpacity: 0.1 });                                                          // 
var p2 = board.create('glider', [2, -1, c1]);                                                                                      // p2 glides on circle c1

var rot = board.create('transform', [function() { return Math.PI / 4; }, p1], { type: 'rotate' });         // rot is defined by the angle BAC
var p3 = board.create('point', [p2, rot], { fixed: true, size: 1, name: 'h1' });                                    // h1: B rotated around A with angle rot
var line = board.create('line', [p1, p3], { strokeOpacity: 0.1 });                                                      // line through A and h1

var p4 = board.create('glider', [0, 0.5, line], { fixed: true });                                                          // C is on the line with a fixed distance from A
var poly = board.create('polygon', [p1, p2, p4], { fillOpacity: 0.05 });
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Polygon II (Polygon transformations)" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   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
   in the credits.
   */
   
   var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-3, 3, 3, -3], keepaspectratio: true });
   var p1 = board.create('point', [-1, -1]);
   
   var c1 = board.create('circle', [p1, 3], { strokeOpacity: 0.1 });                                                          // 
   var p2 = board.create('glider', [2, -1, c1]);                                                                                      // p2 glides on circle c1
   
   var rot = board.create('transform', [function() { return Math.PI / 4; }, p1], { type: 'rotate' });         // rot is defined by the angle BAC
   var p3 = board.create('point', [p2, rot], { fixed: true, size: 1, name: 'h1' });                                    // h1: B rotated around A with angle rot
   var line = board.create('line', [p1, p3], { strokeOpacity: 0.1 });                                                      // line through A and h1
   
   var p4 = board.create('glider', [0, 0.5, line], { fixed: true });                                                          // C is on the line with a fixed distance from A
   var poly = board.create('polygon', [p1, p2, p4], { fillOpacity: 0.05 });
</jsxgraph>
The triangle *ABC* can be moved by dragging *A* and it can be rotated around *A* by moving *B*.
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-3, 3, 3, -3], keepaspectratio: true });
var p1 = board.create('point', [-1, -1]);

var c1 = board.create('circle', [p1, 3], { strokeOpacity: 0.1 });                                                          // 
var p2 = board.create('glider', [2, -1, c1]);                                                                                      // p2 glides on circle c1

var rot = board.create('transform', [function() { return Math.PI / 4; }, p1], { type: 'rotate' });         // rot is defined by the angle BAC
var p3 = board.create('point', [p2, rot], { fixed: true, size: 1, name: 'h1' });                                    // h1: B rotated around A with angle rot
var line = board.create('line', [p1, p3], { strokeOpacity: 0.1 });                                                      // line through A and h1

var p4 = board.create('glider', [0, 0.5, line], { fixed: true });                                                          // C is on the line with a fixed distance from A
var poly = board.create('polygon', [p1, p2, p4], { fillOpacity: 0.05 });

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 in the credits.