geometry_basics_circle_area_in_2d.md

Geometry Basics: Circle Area in 2D

Description

This series of katas will introduce you to basics of doing geometry with computers.

Write the function circleArea/CircleArea which takes in a Circle object and calculates the area of that circle. The Circle class can be seen below:

# Represents a Circle where center is a Point and radius is a Number
class Circle
  attr_accessor :center, :radius

  def initialize(center, radius)
    @center = center
    @radius = radius
  end
end

And the Point class can be seen below:

# Represents a Point where x and y are Numbers
class Point
  attr_accessor :x, :y

  def initialize(x, y)
    @x = x
    @y = y
  end
end

Tests round answers to 6 decimal places.

My Solution

def circle_area(circle)
  Math::PI * circle.radius**2
end