diff --git a/triangle/src/lib.rs b/triangle/src/lib.rs
index 4d28575..6699020 100644
--- a/triangle/src/lib.rs
+++ b/triangle/src/lib.rs
@@ -1,19 +1,35 @@
-pub struct Triangle;
+pub struct Triangle{
+    side_one:u64,
+    side_two:u64,
+    side_three:u64
+}
 
 impl Triangle {
     pub fn build(sides: [u64; 3]) -> Option<Triangle> {
-        unimplemented!("Construct new Triangle from following sides: {:?}. Return None if the sides are invalid.", sides);
+        if sides[0] <= 0 || sides[1] <= 0 || sides[2] <= 0{
+            None
+        } else if sides[0] + sides[1] < sides[2] ||
+                  sides[1] + sides[2] < sides[0] ||
+                  sides[2] + sides[0] < sides[1]{
+            None
+        }
+        else{
+            Some(Triangle{side_one:sides[0],side_two:sides[1],side_three:sides[2]})
+        }
+
     }
 
     pub fn is_equilateral(&self) -> bool {
-        unimplemented!("Determine if the Triangle is equilateral.");
+        self.side_one == self.side_two && self.side_two == self.side_three
     }
 
     pub fn is_scalene(&self) -> bool {
-        unimplemented!("Determine if the Triangle is scalene.");
+        self.side_one != self.side_two && 
+        self.side_two != self.side_three &&
+        self.side_one != self.side_three
     }
 
     pub fn is_isosceles(&self) -> bool {
-        unimplemented!("Determine if the Triangle is isosceles.");
+        !self.is_scalene() && !self.is_equilateral()
     }
 }
diff --git a/triangle/tests/triangle.rs b/triangle/tests/triangle.rs
index c93221d..f3e4d8a 100644
--- a/triangle/tests/triangle.rs
+++ b/triangle/tests/triangle.rs
@@ -8,7 +8,6 @@ fn positive_length_sides_are_ok() {
 }
 
 #[test]
-#[ignore]
 fn zero_length_sides_are_illegal() {
     let sides = [0, 0, 0];
     let triangle = Triangle::build(sides);
@@ -16,7 +15,6 @@ fn zero_length_sides_are_illegal() {
 }
 
 #[test]
-#[ignore]
 fn one_length_zero_side_first() {
     let sides = [0, 2, 2];
     let triangle = Triangle::build(sides);
@@ -24,7 +22,6 @@ fn one_length_zero_side_first() {
 }
 
 #[test]
-#[ignore]
 fn one_length_zero_side_second() {
     let sides = [2, 0, 2];
     let triangle = Triangle::build(sides);
@@ -32,7 +29,6 @@ fn one_length_zero_side_second() {
 }
 
 #[test]
-#[ignore]
 fn one_length_zero_side_third() {
     let sides = [2, 2, 0];
     let triangle = Triangle::build(sides);
@@ -40,7 +36,6 @@ fn one_length_zero_side_third() {
 }
 
 #[test]
-#[ignore]
 fn equilateral_triangles_have_equal_sides() {
     let sides = [2, 2, 2];
     let triangle = Triangle::build(sides).unwrap();
@@ -49,7 +44,6 @@ fn equilateral_triangles_have_equal_sides() {
 }
 
 #[test]
-#[ignore]
 fn larger_equilateral_triangles_have_equal_sides() {
     let sides = [10, 10, 10];
     let triangle = Triangle::build(sides).unwrap();
@@ -58,7 +52,6 @@ fn larger_equilateral_triangles_have_equal_sides() {
 }
 
 #[test]
-#[ignore]
 fn isosceles_triangles_have_two_equal_sides_one() {
     let sides = [3, 4, 4];
     let triangle = Triangle::build(sides).unwrap();
@@ -68,7 +61,6 @@ fn isosceles_triangles_have_two_equal_sides_one() {
 }
 
 #[test]
-#[ignore]
 fn isosceles_triangles_have_two_equal_sides_two() {
     let sides = [4, 4, 3];
     let triangle = Triangle::build(sides).unwrap();
@@ -78,7 +70,6 @@ fn isosceles_triangles_have_two_equal_sides_two() {
 }
 
 #[test]
-#[ignore]
 fn isosceles_triangles_have_two_equal_sides_three() {
     let sides = [4, 3, 4];
     let triangle = Triangle::build(sides).unwrap();
@@ -88,7 +79,6 @@ fn isosceles_triangles_have_two_equal_sides_three() {
 }
 
 #[test]
-#[ignore]
 fn isosceles_triangles_have_two_equal_sides_four() {
     let sides = [4, 7, 4];
     let triangle = Triangle::build(sides).unwrap();
@@ -98,7 +88,6 @@ fn isosceles_triangles_have_two_equal_sides_four() {
 }
 
 #[test]
-#[ignore]
 fn scalene_triangle_has_no_equal_sides_one() {
     let sides = [3, 4, 5];
     let triangle = Triangle::build(sides).unwrap();
@@ -108,7 +97,6 @@ fn scalene_triangle_has_no_equal_sides_one() {
 }
 
 #[test]
-#[ignore]
 fn scalene_triangle_has_no_equal_sides_two() {
     let sides = [5, 4, 6];
     let triangle = Triangle::build(sides).unwrap();
@@ -118,7 +106,6 @@ fn scalene_triangle_has_no_equal_sides_two() {
 }
 
 #[test]
-#[ignore]
 fn scalene_triangle_has_no_equal_sides_three() {
     let sides = [10, 11, 12];
     let triangle = Triangle::build(sides).unwrap();
@@ -128,7 +115,6 @@ fn scalene_triangle_has_no_equal_sides_three() {
 }
 
 #[test]
-#[ignore]
 fn scalene_triangle_has_no_equal_sides_four() {
     let sides = [5, 4, 2];
     let triangle = Triangle::build(sides).unwrap();
@@ -138,7 +124,6 @@ fn scalene_triangle_has_no_equal_sides_four() {
 }
 
 #[test]
-#[ignore]
 fn sum_of_two_sides_must_equal_or_exceed_the_remaining_side_one() {
     let sides = [7, 3, 2];
     let triangle = Triangle::build(sides);
@@ -146,7 +131,6 @@ fn sum_of_two_sides_must_equal_or_exceed_the_remaining_side_one() {
 }
 
 #[test]
-#[ignore]
 fn sum_of_two_sides_must_equal_or_exceed_the_remaining_side_two() {
     let sides = [1, 1, 3];
     let triangle = Triangle::build(sides);
@@ -154,7 +138,6 @@ fn sum_of_two_sides_must_equal_or_exceed_the_remaining_side_two() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "generic")]
 fn scalene_triangle_with_floating_point_sides() {
     let sides = [0.4, 0.6, 0.3];
@@ -165,7 +148,6 @@ fn scalene_triangle_with_floating_point_sides() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "generic")]
 fn equilateral_triangles_with_floating_point_sides() {
     let sides = [0.2, 0.2, 0.2];
@@ -175,7 +157,6 @@ fn equilateral_triangles_with_floating_point_sides() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "generic")]
 fn isosceles_triangle_with_floating_point_sides() {
     let sides = [0.3, 0.4, 0.4];
@@ -186,7 +167,6 @@ fn isosceles_triangle_with_floating_point_sides() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "generic")]
 fn invalid_triangle_with_floating_point_sides_one() {
     let sides = [0.0, 0.4, 0.3];
@@ -195,7 +175,6 @@ fn invalid_triangle_with_floating_point_sides_one() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "generic")]
 fn invalid_triangle_with_floating_point_sides_two() {
     let sides = [0.1, 0.3, 0.5];