geometry.ts

export interface Shape {
  circumference(): number;
  area(): number;
}

export class Point2D {
  constructor(
    public x: number,
    public y: number,
  ) {}

  distanceTo(other: Point2D): number {
    return Math.sqrt(
      Math.abs(this.x - other.x) ** 2 + Math.abs(this.y - other.y) ** 2,
    );
  }
}

export class Circle implements Shape {
  constructor(
    private center: Point2D,
    private radius: number,
  ) {}

  circumference(): number {
    return 2 * Math.PI * this.radius;
  }

  area(): number {
    return Math.PI * this.radius ** 2;
  }

  diameter(): number {
    return 2 * this.radius;
  }
}

export class Rectangle implements Shape {
  constructor(
    private bottomLeft: Point2D,
    private topRight: Point2D,
  ) {}

  circumference(): number {
    return 2 * (this.width() + 2 * this.height());
  }

  area(): number {
    return this.width() * this.height();
  }

  diagonal(): number {
    return this.bottomLeft.distanceTo(this.topRight);
  }

  private width(): number {
    return this.topRight.x - this.bottomLeft.x;
  }

  private height(): number {
    return this.topRight.y - this.bottomLeft.y;
  }
}