Hi Andrew

Hi Natasha

Thank you for your question.

It looks like rather than using the Excel Pie Chart feature in PowerPoint the authors used SmartArt to create the shapes.

Go to Insert > SmartArt and got to the Cycle group of shapes. I think the shape the authors used was the first of the two pie chart shapes. If you click it to insert it into your document you will see it has the arrow around the outside.

If you remove all but one of the slices you will get the circle shape with the arrow all the way around the edge.

Let me know if this is the right shape and if you have any further questions.

Kind regards,
Andrew