ILLUSTRATOR: Combining Shapes

First I used the shape tool to create a polygon. Next I made a star and praced it obove the polygon but still touching. Then I selected both images and pressed the add button, this connected both fugures. Next I created a star under the poygon and selected both figuers then selected the subtract button thus finishing my first figure. To make the second figure I did the same thing but instead of a polygon I used a cirlce.