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- .geometry "version 0.1";
- v1 = .free(-0.002717, 0.008152, .invisible, "1");
- v2 = .free(0.755435, 0.013587, .invisible, "2");
- c1 = .c.vv(v1, v2);
- v3 = .vonc(c1, 0.689996, 0.316328, .invisible, .cross);
- v4 = .vonc(c1, -0.230885, 0.731176, .green, .cross);
- v5 = .vonc(c1, -0.760486, 0.032862, .green, .cross);
- v6 = .vonc(c1, -0.048583, -0.748631, .green, .cross);
- v7 = .v.vvmid(v3, v6, .invisible, .plus);
- v8 = .v.vvmid(v3, v4, .invisible, .plus);
- v9 = .v.vvmid(v3, v5, .invisible, .plus);
- c2 = .c.vv(v8, v3);
- c3 = .c.vv(v9, v3);
- c4 = .c.vv(v7, v3);
- v11 = .v.cc(c4, c3, 2, .red, .plus);
- v12 = .v.cc(c4, c2, 2, .red, .plus);
- v15 = .v.cc(c3, c2, 2, .red, .plus);
- l1 = .l.vv(v11, v12, .red);
- l2 = .l.vv(v12, v15, .red);
- l3 = .l.vv(v15, v11, .red);
- l4 = .l.vv(v7, v7, .red);
- .text("Three Chords:");
- .text("");
- .text("If three chords of a circle share a common point, and those");
- .text("chords are used as diameters of three circles, then the three");
- .text("pair-wise intersections of the circles lie in a straight line.");
- .text("In the figure, the three green points can be moved to control the");
- .text("three chords. Keep them in the same order, or the program may");
- .text("choose the common point of the chords as the intersection.");
-