① start PowerPoint2013, click Insert--shape, select ellipse, teach you a trick, hold down the SHIFT key to draw a positive circle.
② after drawing a circle, use the copy and paste method to make another circle.
③ adjusts the size of one of the circles, right click on the small circle, and set the object format.
④ the fill color to white and moves inside the circle.
⑤ Right-click the great circle and place it at the bottom.
⑥ok, concentric rings have been made, put them in the right place.