completing the homework

geom.js

@@ -3,27 +3,79 @@ class Rectangle {
     this.length = length;
     this.width = width;
   }
+  isSquare() {
+    if (this.width === this.length) {
+      return true
+    } else { return false }
+  }
+  area() {
+    return this.width * this.length
+  }
+  perimeter() {
+    return this.width + this.length
+  }
 }
 
 
 class Triangle {
-  constructor(sideA, sideB, sideC){
+  constructor(sideA, sideB, sideC) {
     this.sideA = sideA;
     this.sideB = sideB;
     this.sideC = sideC;
   }
+  isEquilateral() {
+    if (this.sideA === this.sideB && this.sideB === this.sideC) {
+      return true
+    } else { return false }
+  }
+  isIsosceles() {
+    if (this.sideA === this.sideB || this.sideA === this.sideC || this.sideB === this.sideC) {
+      return true
+    } else { return false }
+  }
+  area() {
+    var s = 0.5 * (sideA + sideB + sideC)
+    var a = (s * (s - this.sideA)(s - this.sideB)(s - this.sideC))
+    return Math.pow(a, 0.5)
+  }
+  isObtuse() {
+    var a = Math.pow(this.sideA, 2)
+    var b = Math.pow(this.sideB, 2)
+    var c = Math.pow(this.sideC, 2)
+    if (a > b && a > c) {
+      if (a > (b + c)) {
+        return true
+      } else { return false }
+    }
+    if (b > a && b > c) {
+      if (b > (a + c)) {
+        return true
+      } else { return false }
+    }
+    if (c > a && c > b) {
+      if (c > (a + b)) {
+        return true
+      } else { return false }
+    }
+
+  }
 }
 
 
 class LineSegment {
-  constructor(x1, y1, x2, y2){
+  constructor(x1, y1, x2, y2) {
     this.x1 = x1;
     this.y1 = y1;
     this.x2 = x2;
     this.y2 = y2;
   }
+  length() {
+    return Math.sqrt(Math.pow(this.x2 - this.x1, 2) +
+      Math.pow(this.y2 - this.y1, 2) * 1.0);
+  }
 }
 
+
 // NOTE: DO NOT REMOVE OR ALTER
 module.exports = {
   Rectangle: Rectangle,