Inheritance is bad because
WheelandTortillashould not both inherit fromCircle.– David Reid
One very common problem with class inheritance, of course, is that you don't get anything so clean as Tortilla and Wheel inheriting from Circle. Generally in a large, real-world project, you get Circle inheriting from both Tortilla and Wheel, because you already had a Tortilla and a Wheel at the time you discovered you needed a Circle, and it was so much easier to just do that for now.
So now all Circles have numberOfSpokes and also cornOrFlour attributes.