Done

geom.js

@@ -3,7 +3,39 @@ class Rectangle {
     this.length = length;
     this.width = width;
   }
+  //isSquare - returns true if the rectangle is a square
+  isSquare(){
+    if (this.width===this.length){
+      return true;
+    }
+    else {
+      return false;
+    }
+  }
+
+// area - calculates the area of the rectangle.
+
+area(){
+  return this.width*this.length;
 }
+// perimeter - calculates the perimeter of the rectangle.
+
+perimeter(){
+  return 2*(this.width+this.length);
+}
+}
+// Create a few rectangles with different lengths and widths.
+const rectangle1= new Rectangle(10,5);
+const rectangle2= new Rectangle(4,5);
+const rectangle3= new Rectangle(2,6);
+
+
+
+
+
+
+
+
 
 
 class Triangle {
@@ -12,16 +44,52 @@ class Triangle {
     this.sideB = sideB;
     this.sideC = sideC;
   }
-}
+  // isEquilateral - returns true if the triangle is equilateral.
+  isEquilateral(){
+    if ( this.sideA === this.sideB && this.sideB === this.sideC){
+      return true;
+    }
+    else{
+      return false;
+    }
+  }
+
+  // isIsosceles - return true if the triangle is isosceles.
+  isIsosceles(){
+    if ( this.sideA === this.sideB || this.sideA === this.sideC || this.sideB === this.sideC ){
+      return true;
+    }
+    else{
+      return false;
+    }
+  }
+  // area - calculates the area of the Triangle.
+  area(){
+    var s=0.5*( this.sideA + this.sideB +this.sideC)
+    return Math.sqrt(s*(s-this.sideA)*(s-this.sideB)*(s-this.sideC));
+  }
+  // isObtuse - returns true if the triangle is obtuse.
 
 
+}
+trinangle1 =new Triangle(2,3,4);
+
 class LineSegment {
   constructor(x1, y1, x2, y2){
     this.x1 = x1;
     this.y1 = y1;
     this.x2 = x2;
     this.y2 = y2;
   }
+
+  //length – calculates the length of the (x1, y1) --> (x2, y2) line segment.
+
+  lineLength(){
+    var point1= Math.pow( this.y1 -  this.y2 , 2);
+    var point2= Math.pow( this.x1 -  this.x2 , 2);
+    return Math.sqrt(point1+point2);
+
+  }
 }
 
 // NOTE: DO NOT REMOVE OR ALTER