diff --git a/test/cases/2d.cpp b/test/cases/2d.cpp
index 1eae2be..0be2e94 100644
--- a/test/cases/2d.cpp
+++ b/test/cases/2d.cpp
@@ -15,6 +15,7 @@ AddTestCase _(1, "2d.hpp", [](TestCase& t) {
 	t.expectTrue([] { return Circle({0, 0}, 1).contain({0, 1}); });
 	t.expectFalse([] { return Circle({1, 0}, 1.4).contain({0, -1}); });
 	t.expectTrue([] { return Circle({1, 1}, 1.42).contain({0, 0}); });
+	t.expectTrue([] { return Circle({1.83649, -.12711}, .05484).contain({1.82541, -.1019}); });
 
 	t.expectEq<Vec2>([] { return Polygon<3>{{0, 0}, {1, 0}, {1, 1}}.vertex[0]; }, {0, 0});
 
@@ -29,6 +30,8 @@ AddTestCase _(1, "2d.hpp", [](TestCase& t) {
 	t.expectTrue([pA] { return pA.contain({2.16, -1.9}); });
 	t.expectFalse([pA] { return pA.contain({1.28, -.8}); });
 	t.expectFalse([pA] { return pA.contain({1.68, -1.94}); });
+	t.expectFalse([pA] { return pA.contain({1.83649, -.12711}); });
+	t.expectTrue([pA] { return pA.contain({1.82541, -.1019}); });
 
 	t.expectTrue([] { return intersect(Circle({1, 1}, 2), Circle({1, 1}, 1)); });
 	t.expectTrue([] { return intersect(Circle({1, 1}, 1.5), Circle({3, 1}, 1.5)); });
@@ -45,7 +48,12 @@ AddTestCase _(1, "2d.hpp", [](TestCase& t) {
 	t.expectFalse([] { return intersect(Circle({0, 0}, 2), Polygon<3>{{0, -3}, {14, -3}, {0, -5}}); });
 	t.expectFalse([pA] { return intersect(Circle({-1, 1}, 1.4), pA); });
 	t.expectTrue([pA] { return intersect(Circle({-3, -2}, 1.2), pA); });
-	t.expectTrue([pA] { return intersect(Circle({1.83649, -.07532}, .05484), pA); });
+	t.expectTrue([pA] { return intersect(Circle({1.83649, -.12711}, .05484), pA); });
 	t.expectFalse([pA] { return intersect(Circle({1.5595, -.42437}, .08794), pA); });
+
+	t.expectTrue([] { return intersect(Polygon<4>{{3, 1}, {0, 1}, {0, 0}, {3, 0}}
+		, Polygon<4>{{.1, .1}, {.2, .1}, {.2, .2}, {.1, .2}}); });
+	t.expectFalse([pA] { return intersect(pA, Polygon<3>{{1.5595, -.42437}, {1.64733, -.41987}, {1.83649, -.12711}}); });
+	t.expectTrue([pA] { return intersect(pA, Polygon<3>{{1.5595, -.42437}, {1.64733, -.41987}, {1.82541, -.1019}}); });
 });
 }