JSXGraph
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Angles
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/angles" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Angles" 
    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 4.0 International License.
    https://creativecommons.org/licenses/by/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-2, 2, 2, -2],
        keepaspectratio: true
    });
    var A = board.create('point', [-1, -1]),
        B = board.create('point', [1, -1]),
        C = board.create('point', [0, 1]),
        alpha = board.create('angle', [B, A, C], {
            type: 'sector',
            orthoType: 'square',
            orthoSensitivity: 2,
            radius: 0.5
        }),
        beta = board.create('angle', [C, B, A], {
            type: 'sector',
            orthoType: 'sectordot',
            orthoSensitivity: 2,
            radius: 0.2
        });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution 4.0 International License.
https://creativecommons.org/licenses/by/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!

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-2, 2, 2, -2],
    keepaspectratio: true
});
var A = board.create('point', [-1, -1]),
    B = board.create('point', [1, -1]),
    C = board.create('point', [0, 1]),
    alpha = board.create('angle', [B, A, C], {
        type: 'sector',
        orthoType: 'square',
        orthoSensitivity: 2,
        radius: 0.5
    }),
    beta = board.create('angle', [C, B, A], {
        type: 'sector',
        orthoType: 'sectordot',
        orthoSensitivity: 2,
        radius: 0.2
    });
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Angles" 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 4.0 International License.
   https://creativecommons.org/licenses/by/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   const board = JXG.JSXGraph.initBoard(BOARDID, {
       boundingbox: [-2, 2, 2, -2],
       keepaspectratio: true
   });
   var A = board.create('point', [-1, -1]),
       B = board.create('point', [1, -1]),
       C = board.create('point', [0, 1]),
       alpha = board.create('angle', [B, A, C], {
           type: 'sector',
           orthoType: 'square',
           orthoSensitivity: 2,
           radius: 0.5
       }),
       beta = board.create('angle', [C, B, A], {
           type: 'sector',
           orthoType: 'sectordot',
           orthoSensitivity: 2,
           radius: 0.2
       });
</jsxgraph>
// Define the id of your board in BOARDID

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-2, 2, 2, -2],
    keepaspectratio: true
});
var A = board.create('point', [-1, -1]),
    B = board.create('point', [1, -1]),
    C = board.create('point', [0, 1]),
    alpha = board.create('angle', [B, A, C], {
        type: 'sector',
        orthoType: 'square',
        orthoSensitivity: 2,
        radius: 0.5
    }),
    beta = board.create('angle', [C, B, A], {
        type: 'sector',
        orthoType: 'sectordot',
        orthoSensitivity: 2,
        radius: 0.2
    });

license

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