I don't understand what's wrong.. any help please :)

class Complex
    attr_accessor :real, :imaginary, :angle, :radius
    def initialization (real, imaginary)
        @real = real
        @imaginary = imaginary
        @radius = Math.sqrt(real**2 + imaginary**2)
        @angle = Math.atan((imaginary.to_f/real)) # c-style casting (float) sth ## doesn't work here in RUBY It's to_f/real method
    end
    def +c
        return Complex.new(c.real + real, c.imaginary + imaginary)
    end
    def -c
        return Complex.new(real - c.real, imaginary - c.imaginary)
    end
    def *c
        return complex.new(real * c.real - imaginary * c.imaginary, real * c.imaginary + imaginary * c.real)
    end
    def conjugate
        temp = @real - @imaginary # try without @ to use accessor later
        return Self * temp
    end
    def polar_to_rectangular (angle, radius)
        @angle = angle
        @radius = radius
        @real = radius * Math.cos(@angle)
        @imaginary = raduius * Math.sin(@angle)
    end
    def /c
        temp = Complex.new(0,0)
        temp.polar_to_rectangular(radius / c.radius, angle - c.angle)
        return temp
    end       

end

Complex mine(1,1)
puts(mine.real)
# error undefined mine?? what have I done wrong?