diff --git a/geom.js b/geom.js
index d942747..3135514 100644
--- a/geom.js
+++ b/geom.js
@@ -3,7 +3,19 @@ class Rectangle {
     this.length = length;
     this.width = width;
   }
-}
+  isSquare() {
+    if(this.length === this.width) {
+      return true;
+    } else return false;
+  }
+  area() {
+    return this.length * this.width;
+    }
+  perimeter() {
+    return 2 * (this.length + this.width);
+    }
+  }
+
 
 
 class Triangle {
@@ -12,9 +24,23 @@ class Triangle {
     this.sideB = sideB;
     this.sideC = sideC;
   }
+  isEquilateral() {
+    return (this.sideA === this.sideB && this.sideB === this.sideC);
+    }
+  isIsosceles() {
+    return (this.sideA === this.sideB || this.sideB === this.sideC || this.sideA === this.sideC);
+  }
+  area() {
+    let result= (this.sideA + this.sideB + this.sideC) / 2;
+    return Math.sqrt(result * ((result - this.sideA) * (result - this.sideB) * (result - this.sideC)));
+  }
+  isObtuse() {
+  
+  }
 }
 
 
+
 class LineSegment {
   constructor(x1, y1, x2, y2){
     this.x1 = x1;
@@ -22,8 +48,13 @@ class LineSegment {
     this.x2 = x2;
     this.y2 = y2;
   }
+  length() {
+    return Math.sqrt((this.x2 - this.x1) * (this.x2 - this.x1) + (this.y2 - this.y1) * (this.y2 - this.y1));
+  }
 }
 
+
+
 // NOTE: DO NOT REMOVE OR ALTER
 module.exports = {
   Rectangle: Rectangle,