37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
// inscribe trapezoid
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var R = 5;
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var Delta = 0.5
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const b = JXG.JSXGraph.initBoard('jsxgraph', {
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boundingbox: [-R-Delta,R+Delta,R+Delta,-1], axis:true
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});
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var xax = b.create("segment", [[0,0],[R,0]]);
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var P4 = b.create("glider", [R/2,0, xax], {name: "P_4=(r,0)"});
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var CL = b.create('point', [function() {return -P4.X()},0], {name:''});
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var CR = b.create('point', [function() {return P4.X()},0], {name:''});
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var C = b.create('semicircle', [CL,CR]);
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var Crestricted = b.create("functiongraph",
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[function(x) {
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r = P4.X();
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y = Math.sqrt(r*r - x*x);
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return y;
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}, 0, function() {return P4.X()}]);
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var P3 = b.create("glider", [
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P4.X()/2,
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Math.sqrt(P4.X()*P4.X()*(1 - 1/4)),
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Crestricted], {name:"P_3=(x,y)"});
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var P1 = b.create('point', [function() {return -Math.abs(P4.X());},
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function() {return P4.Y();}], {name:'P_1'});
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var P2 = b.create('point', [function() {return -P3.X();},
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function() {return P3.Y();}], {name:'P_2'});
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var poly = b.create('polygon',[P1, P2, P3, P4], { borders:{strokeColor:'black'} });
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b.create('text',[-1.5,.25, function(){ return 'Area='+ poly.Area().toFixed(1); }]);
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