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Update content.en-GB.md (#327)

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Fix typo
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Luca Leone
2021-09-01 00:16:11 +02:00
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docs/chapters/pointcurves/content.en-GB.md
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@@ -18,7 +18,7 @@ With this code in place, creating a quadratic curve from three points is literal
For cubic curves we need to do a little more work, but really only just a little. We're first going to assume that a decent curve through the three points should approximate a circular arc, which first requires knowing how to fit a circle to three points. You may remember (if you ever learned it!) that a line between two points on a circle is called a [chord](https://en.wikipedia.org/wiki/Chord_%28geometry%29), and that one property of chords is that the line from the center of any chord, perpendicular to that chord, passes through the center of the circle. For cubic curves we need to do a little more work, but really only just a little. We're first going to assume that a decent curve through the three points should approximate a circular arc, which first requires knowing how to fit a circle to three points. You may remember (if you ever learned it!) that a line between two points on a circle is called a [chord](https://en.wikipedia.org/wiki/Chord_%28geometry%29), and that one property of chords is that the line from the center of any chord, perpendicular to that chord, passes through the center of the circle.
That means that if we have have three points on a circle, we have three (different) chords, and consequently, three (different) lines that go from those chords through the center of the circle: if we find two of those lines, then their intersection will be our circle's center, and the circle's radius will—by definition!—be the distance from the center to any of our three points: That means that if we have three points on a circle, we have three (different) chords, and consequently, three (different) lines that go from those chords through the center of the circle: if we find two of those lines, then their intersection will be our circle's center, and the circle's radius will—by definition!—be the distance from the center to any of our three points:
<graphics-element title="Finding a circle through three points" src="./circle.js"></graphics-element> <graphics-element title="Finding a circle through three points" src="./circle.js"></graphics-element>