assertTrue(t.containsPoint(a));
assertTrue(t.containsPoint(b));
assertTrue(t.containsPoint(c));
assertFalse(t.containsPoint(new Vec2D(0, -101)));
// check anti-clockwise
t.flipVertexOrder();
assertTrue(t.containsPoint(new Vec2D(0, -50)));
assertTrue(t.containsPoint(a));
assertTrue(t.containsPoint(b));
assertTrue(t.containsPoint(c));
assertFalse(t.containsPoint(new Vec2D(0, -101)));