add task solution

src/figuresClasses.ts

@@ -1,11 +1,73 @@
-export interface Figure {}
+type Shape = `triangle` | `circle` | `rectangle`;
+type Color = 'red' | 'green' | 'blue';
 
-export class Triangle implements Figure {}
+export interface Figure {
+  shape: Shape;
+  color: Color;
+  getArea(): number;
+}
+
+export class Triangle implements Figure {
+  shape: Shape = 'triangle';
+
+  constructor(
+    public color: Color,
+    public a: number,
+    public b: number,
+    public c: number,
+  ) {
+    if (a <= 0 || b <= 0 || c <= 0) {
+      throw new Error('can `t be less then 0');
+    }
+
+    if (a + b <= c || a + c <= b || b + c <= a) {
+      throw new Error('wrong triangle size');
+    }
+  }
+
+  getArea(): number {
+    const p = (this.a + this.b + this.c) / 2;
+    const area = Math.sqrt(p * (p - this.a) * (p - this.b) * (p - this.c));
+
+    return Math.floor(area * 100) / 100;
+  }
+}
 
-export class Circle implements Figure {}
+export class Circle implements Figure {
+  shape: Shape = 'circle';
 
-export class Rectangle implements Figure {}
+  constructor(
+    public color: Color,
+    public radius: number,
+  ) {
+    if (radius <= 0) {
+      throw new Error('can `t be less then 0');
+    }
+  }
+
+  getArea(): number {
+    return Math.floor(this.radius * this.radius * Math.PI * 100) / 100;
+  }
+}
+
+export class Rectangle implements Figure {
+  shape: Shape = 'rectangle';
+
+  constructor(
+    public color: Color,
+    public width: number,
+    public height: number,
+  ) {
+    if (width <= 0 || height <= 0) {
+      throw new Error('can `t be less then 0');
+    }
+  }
+
+  getArea(): number {
+    return Math.floor(this.width * this.height * 100) / 100;
+  }
+}
 
-export function getInfo(figure): string {
-  return typeof figure;
+export function getInfo(figure: Figure): string {
+  return 'A ' + figure.color + ' ' + figure.shape + ' - ' + figure.getArea();
 }