class Numeric
def degrees
self * Math::PI / 180
end
end
puts 90.degrees
puts Math::tan(45.degrees) # => 1.0
puts Math::cos(90.degrees) # => 6.12303176911189e-17
puts Math::sin(90.degrees) # => 1.0
puts Math::sin(89.9.degrees) # => 0.999998476913288
puts Math::sin(45.degrees) # => 0.707106781186547
puts Math::cos(45.degrees) # => 0.707106781186548