From 3377228690d94d651128b5c723ab0c8b0485152f Mon Sep 17 00:00:00 2001
From: Leandro Lima <leandro.lima2@academico.ufpb.br>
Date: Sun, 24 May 2026 18:21:57 -0300
Subject: [PATCH 1/2] Solution

---
 src/figuresClasses.ts | 98 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 92 insertions(+), 6 deletions(-)

diff --git a/src/figuresClasses.ts b/src/figuresClasses.ts
index 753711299..b0b971153 100644
--- a/src/figuresClasses.ts
+++ b/src/figuresClasses.ts
@@ -1,11 +1,97 @@
-export interface Figure {}
+type ShapeType = 'triangle' | 'circle' | 'rectangle';
+type ColorType = 'red' | 'green' | 'blue';
 
-export class Triangle implements Figure {}
+export interface Figure {
+  shape: ShapeType;
+  color: ColorType;
+  getArea(): number;
+}
+
+export class Triangle implements Figure {
+  shape: ShapeType = 'triangle';
+
+  color: ColorType;
+
+  a: number;
+
+  b: number;
+
+  c: number;
+
+  constructor(color: ColorType, a: number, b: number, c: number) {
+    if (a <= 0 || b <= 0 || c <= 0) {
+      throw new Error('Sides must be greater than 0');
+    }
+
+    if (a >= b + c || b >= a + c || c >= a + b) {
+      throw new Error("Sides can't form a triangle");
+    }
+
+    this.color = color;
+    this.a = a;
+    this.b = b;
+    this.c = c;
+  }
+
+  getArea(): number {
+    const p: number = (this.a + this.b + this.c) / 2;
+    const area: number = Math.sqrt(
+      p * (p - this.a) * (p - this.b) * (p - this.c),
+    );
+
+    return Math.floor(area * 100) / 100;
+  }
+}
+
+export class Circle implements Figure {
+  shape: ShapeType = 'circle';
+
+  color: ColorType;
 
-export class Circle implements Figure {}
+  radius: number;
 
-export class Rectangle implements Figure {}
+  constructor(color: ColorType, radius: number) {
+    if (radius <= 0) {
+      throw new Error('Radius must be greater than 0');
+    }
+
+    this.color = color;
+    this.radius = radius;
+  }
+
+  getArea(): number {
+    const area: number = Math.PI * this.radius * this.radius;
+
+    return Math.floor(area * 100) / 100;
+  }
+}
+
+export class Rectangle implements Figure {
+  shape: ShapeType = 'rectangle';
+
+  color: ColorType;
+
+  width: number;
+
+  height: number;
+
+  constructor(color: ColorType, width: number, height: number) {
+    if (width <= 0 || height <= 0) {
+      throw new Error('Width and height must be greater than 0');
+    }
+
+    this.color = color;
+    this.width = width;
+    this.height = height;
+  }
+
+  getArea(): number {
+    const area: number = this.width * this.height;
+
+    return Math.floor(area * 100) / 100;
+  }
+}
 
-export function getInfo(figure): string {
-  return typeof figure;
+export function getInfo(figure: Figure): string {
+  return `A ${figure.color} ${figure.shape} - ${figure.getArea()}`;
 }

From 849fec6b3d61c68e3d5c74cc73dd57410d2a1f8a Mon Sep 17 00:00:00 2001
From: Leandro Lima <leandro.lima2@academico.ufpb.br>
Date: Sun, 24 May 2026 18:27:49 -0300
Subject: [PATCH 2/2] New solution

---
 src/figuresClasses.ts | 54 +++++++++++++++----------------------------
 1 file changed, 19 insertions(+), 35 deletions(-)

diff --git a/src/figuresClasses.ts b/src/figuresClasses.ts
index b0b971153..eabb7f702 100644
--- a/src/figuresClasses.ts
+++ b/src/figuresClasses.ts
@@ -10,27 +10,19 @@ export interface Figure {
 export class Triangle implements Figure {
   shape: ShapeType = 'triangle';
 
-  color: ColorType;
-
-  a: number;
-
-  b: number;
-
-  c: number;
-
-  constructor(color: ColorType, a: number, b: number, c: number) {
+  constructor(
+    public color: ColorType,
+    public a: number,
+    public b: number,
+    public c: number,
+  ) {
     if (a <= 0 || b <= 0 || c <= 0) {
       throw new Error('Sides must be greater than 0');
     }
 
     if (a >= b + c || b >= a + c || c >= a + b) {
-      throw new Error("Sides can't form a triangle");
+      throw new Error(`sides ${a}, ${b} and ${c} can't form a triangle`);
     }
-
-    this.color = color;
-    this.a = a;
-    this.b = b;
-    this.c = c;
   }
 
   getArea(): number {
@@ -46,17 +38,13 @@ export class Triangle implements Figure {
 export class Circle implements Figure {
   shape: ShapeType = 'circle';
 
-  color: ColorType;
-
-  radius: number;
-
-  constructor(color: ColorType, radius: number) {
+  constructor(
+    public color: ColorType,
+    public radius: number,
+  ) {
     if (radius <= 0) {
       throw new Error('Radius must be greater than 0');
     }
-
-    this.color = color;
-    this.radius = radius;
   }
 
   getArea(): number {
@@ -69,20 +57,14 @@ export class Circle implements Figure {
 export class Rectangle implements Figure {
   shape: ShapeType = 'rectangle';
 
-  color: ColorType;
-
-  width: number;
-
-  height: number;
-
-  constructor(color: ColorType, width: number, height: number) {
+  constructor(
+    public color: ColorType,
+    public width: number,
+    public height: number,
+  ) {
     if (width <= 0 || height <= 0) {
       throw new Error('Width and height must be greater than 0');
     }
-
-    this.color = color;
-    this.width = width;
-    this.height = height;
   }
 
   getArea(): number {
@@ -93,5 +75,7 @@ export class Rectangle implements Figure {
 }
 
 export function getInfo(figure: Figure): string {
-  return `A ${figure.color} ${figure.shape} - ${figure.getArea()}`;
+  const info: string = `${figure.color} ${figure.shape}`;
+
+  return `A ${info} - ${figure.getArea()}`;
 }