christmas_tree2.rb

#!/usr/bin/ruby

puts " " * 22 + "*"
puts " " * 21 + "*" * 3
puts " " * 20 + "*" * 5
puts " " * 19 + "*" * 7
puts " " * 18 + "*" * 9
puts " " * 17 + "*" * 11
puts " " * 16 + "*" * 13
puts " " * 15 + "*" * 15
puts " " * 14 + "*" * 17
puts " " * 13 + "*" * 19
puts " " * 12 + "*" * 21
puts " " * 11 + "*" * 23
puts " " * 10 + "*" * 25
puts " " * 9 + "*" * 27
puts " " * 8 + "*" * 29
puts " " * 7 + "*" * 31
puts " " * 6 + "*" * 33
puts " " * 5 + "*" * 35
puts " " * 4 + "*" * 37
puts " " * 3 + "*" * 39
puts " " * 2 + "*" * 41
puts " " * 1 + "*" * 43
puts " " * 0 + "*" * 45
puts " " * 20 + "I" * 5
puts " " * 20 + "I" * 5