I got confused in math formulas

geom.js

@@ -3,17 +3,53 @@ class Rectangle {
     this.length = length;
     this.width = width;
   }
+  get isSquare(){
+    if (this.height === this.width){
+    return true;
+    }
+    }
+    get calcArea(){
+    return this.height * this.width;
+    }
+
+    get perimeter(){
+        return 2 * (this.height + this.width);
+    }
+
 }
 
+const resultSquare = new Rectangle (4, 4);
+console.log(resultSquare.isSquare)
+
+const result = new Rectangle(3, 4);
+console.log(result.calcArea)
+
+const resultPer = new Rectangle(3, 4);
+console.log(resultPer.perimeter)
+
 
 class Triangle {
   constructor(sideA, sideB, sideC){
     this.sideA = sideA;
     this.sideB = sideB;
     this.sideC = sideC;
   }
+  get isEquilateral(){
+    if (this.sideA === this.saidB & this.sideA === this.sideC)
+    return true;
+ }
+ get isIsosceles(){
+    if (this.sideA === this.sideB & this.sideA !== this.sideC)
+ return true;
+ }
 }
 
+const resultIso = new Triangle (2,2,3);
+console.log(resultIso.isIsosceles)
+
+const checkIsEqu = new Triangle (3, 3, 3);
+console.log(checkIsEqu.isEquilateral) // I got undefined on this
+
 
 class LineSegment {
   constructor(x1, y1, x2, y2){