did all the shapes

geom.js

@@ -3,6 +3,21 @@ class Rectangle {
     this.length = length;
     this.width = width;
   }
+
+  isSquare(){
+    if(this.length === this.width ){
+      return true; 
+    }
+  }
+
+  calculateArea(){
+    let area = this.length*this.width;
+    return area; 
+  }
+  calculatePerimeter(){
+    let perimeter = 2*(this.length+this.width);
+    return perimeter; 
+  }
 }
 
 
@@ -12,6 +27,39 @@ class Triangle {
     this.sideB = sideB;
     this.sideC = sideC;
   }
+
+// Equilateral Triangle:
+// All three sides have equal length
+// All three angles are equal to 60 degrees
+  isEquilateral() {
+    if(this.sideA === this.sideB && this.sideB === this.sideC){
+      return true;
+    }
+  }
+  //has two equal sides
+  isIsosceles(){
+    if(this.sideA === this.sideB) {
+      return true;
+    }
+  }
+
+  //Heron's Formula
+  // I used Math.sqrt() to find the square root
+  area(){
+    let s = (this.sideA + this.sideB + this.sideB)/2
+    let area = s*(s-this.sideA)*(s-this.sideB)*(s-this.sideC);
+    return Math.sqrt(area);
+  }
+
+  isObtuse(){
+    let a = Math.pow(this.sideA,2);
+    let b = Math.pow(this.sideB,2);
+    let c = Math.pow(this.sideC,2);
+    if(c > a+b ){
+      return true;
+    }
+  }
+
 }
 
 
@@ -22,6 +70,15 @@ class LineSegment {
     this.x2 = x2;
     this.y2 = y2;
   }
+
+  calculateLength(){
+    x1 = this.x1;
+    x2 = this.x2;
+    x3 = this.x3;
+    x4 = this.x4;
+    let length = Math.sqrt(Math.pow(x2-x1,2) + Math.pow(y2-y1,2));
+    return length;
+  }
 }
 
 // NOTE: DO NOT REMOVE OR ALTER