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parabola_intuition_1.html
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parabola_intuition_1.html
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<!DOCTYPE html>
<html data-require="math graphie graphie-helpers">
<head>
<meta charset="UTF-8" />
<title>Parabola intuition 1</title>
<script src="../khan-exercise.js"></script>
<style>
.info-box .mini-button {
padding: 0px 5px;
width: 20px;
}
</style>
</head>
<body>
<div class="exercise">
<div class="vars">
<var id="A">randRangeNonZero( -3, 3 )</var>
<var id="X1">randRangeNonZero( -5, 5 )</var>
<var id="Y1">randRangeNonZero( -5, 5 )</var>
</div>
<div class="problems">
<div>
<p class="question">Adjust the leading coefficient and vertex coordinates to make the blue parabola match the orange parabola.</p>
<p>How do these numbers affect the shape and position of a parabola?</p>
<div class="graphie" id="grid">
graphInit({
range: 10,
scale: 20,
tickStep: 1,
axisArrows: "<->"
});
// Plot the orange parabola
style({
stroke: "#FFA500",
fill: "none",
clipRect:[ [-10, -10], [20, 20] ],
arrows: null
});
plot( new Parabola( A, X1, Y1 ).graphieFunction, [-10, 10]);
style({
stroke: "#6495ED",
strokeWidth: 3,
fill: "none",
clipRect:[ [-10, -10], [20, 20] ],
arrows: null
});
graph.currParabola = new Parabola( 1, 0, 0 );
graph.currParabola.plot();
</div>
<div class="solution" data-type="multiple">
<!--
There didn't seem to be an easy way to bind handlers normally after everything had loaded.
It would also be nice to press and hold.
-->
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 20px;" value="+" onclick="updateParabola( 0, 0, -1)" />
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 8px;" value="+" onclick="updateParabola( 1, 0, 0)" />
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 20px;" value="+" onclick="updateParabola( 0, -1, 0)" />
<p id="equation-label" style="margin: 8px 0px 2px 0px"><code>y - 0 = 1(x - 0)^{2}</code></p>
<div style="padding-bottom: 15px">
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 20px;" value="-" onclick="updateParabola( 0, 0, 1)" />
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 8px;" value="-" onclick="updateParabola( -1, 0, 0)" />
<input type="button" class="simple-button action-gradient mini-button" style="margin-left: 20px;" value="-" onclick="updateParabola( 0, 1, 0)" />
</div>
<span class="sol" id="leading-coefficient" style="display: none"><var>A</var></span>
<span class="sol" id="vertex-x" style="display: none"><var>X1</var></span>
<span class="sol" id="vertex-y" style="display: none"><var>Y1</var></span>
</div>
</div>
</div>
</div>
</body>
</html>