Centre and radius of a circle passing through 3 points in a plane: Difference between revisions
Centre and radius of a circle passing through 3 points in a plane (view source)
Revision as of 00:06, 21 February 2024
, 2 months agoAdded Dart
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Line 42:
return 0;
}</syntaxhighlight>
=={{header|Dart}}==
{{trans|C++}}
<syntaxhighlight lang="dart">import 'dart:math';
void findCircle(
double x1, double y1, double x2, double y2, double x3, double y3) {
double x12 = x1 - x2;
double x13 = x1 - x3;
double y12 = y1 - y2;
double y13 = y1 - y3;
double y31 = y3 - y1;
double y21 = y2 - y1;
double x31 = x3 - x1;
double x21 = x2 - x1;
double sx13 = x1 * x1 - x3 * x3;
double sy13 = y1 * y1 - y3 * y3;
double sx21 = x2 * x2 - x1 * x1;
double sy21 = y2 * y2 - y1 * y1;
double f = (sx13 * x12 + sy13 * x12 + sx21 * x13 + sy21 * x13) /
(2 * (y31 * x12 - y21 * x13));
double g = (sx13 * y12 + sy13 * y12 + sx21 * y13 + sy21 * y13) /
(2 * (x31 * y12 - x21 * y13));
double c = -pow(x1, 2) - pow(y1, 2) - 2 * g * x1 - 2 * f * y1;
double h = -g;
double k = -f;
double r = sqrt(h * h + k * k - c);
print("Centre is at ($h, $k)");
print("\nCheck radius as the distance between the centre and the first point: $r");
}
void main() {
findCircle(22.83, 2.07, 14.39, 30.24, 33.65, 17.31);
}</syntaxhighlight>
{{out}}
<pre>Centre is at (18.978515660148815, 16.265410797715866)
=={{header|F_Sharp|F#}}==
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