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circumradius.html
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circumradius.html
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<!DOCTYPE html>
<html data-require="math graphie graphie-helpers graphie-geometry math-format">
<head>
<meta charset="UTF-8" />
<title>Circumradius</title>
<script src="../khan-exercise.js"></script>
</head>
<body>
<div class="exercise">
<div class="vars">
</div>
<div class="problems">
<div id="equi">
<div class="vars">
<var id="ANGLES" data-ensure="ANGLES[ 0 ] % 2 == 0">randomTriangleAngles.triangle()</var>
<var id="CIRCUMLENGTH"></var>
<var id="BD"</var>
<var id="AC"></var>
<var id="CD"></var>
</div>
<div class="problem">
What is the length of <code>AD</code> ? ( <code>AD = DC</code> )
</div>
<div class="question">
<div class="graphie" id="original">
init({
range: [ [-1, 12 ], [ -7, 2.5 ] ]
})
var trA = new Triangle( [ 3, -4 ], [ 60, 60, 60 ] , 16 , {} );
var pointD = findIntersection( bisectAngle( trA.sides[ 0 ], reverseLine( trA.sides[ 2 ] ), 1 ), trA.sides[ 1 ] );
trA.draw()
trA.labels = { "sides" : trA.niceSideLengths, "points": [ "A", "B", "C" ] };
trA.drawLabels();
var radius = lineLength( [ trA.circumCenter, trA.points[ 0 ] ] );
circle( trA.circumCenter, radius );
label( trA.circumCenter, "D", "right" );
line( trA.circumCenter, trA.points[ 0 ] );
line( trA.circumCenter, trA.points[ 2 ] );
</div>
</div>
<div class="solution"><div id="ans"></div></div>
<div class="hints">
<p>Because side <code>DAB</code> and <code>DAC</code> are equal.</p>
<p>ThatAngles <code>DAB</code> and <code>DAC</code> are equal.</p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>