Total circles area

# title: Total circles area
# source: https://rosettacode.org/wiki/Total_circles_area
# category: Rosetta Code
# difficulty: Intro
# summary: Sum the areas of several circles from their radii.
# tags: popular, math, geometry, floats
# vibe: 0.2

def area(radius)
  3.141592653589793 * radius * radius
end

def total_area(radii)
  total = 0.0
  index = 0

  while index < radii.size
    total = total + area(radii[index])
    index = index + 1
  end

  total
end

def run
  radii = [1.0, 2.5, 4.0]
  {
    radii: radii,
    total_area: total_area(radii)
  }
end