These seven elements of a pie or doughnut chart will teach you some important PowerPoint tricks, which will allow you to create an appealing circular diagram. It is using a combination of Excel charts and SmartArt shape editing tricks.

Venn diagram (also called primary diagram, set diagram, or logic diagram) is a diagram that shows all possible logical relations between a finite collection of different sets.

Circular diagrams are very popular, and you probably tried various SmartArt cycle flow diagrams in your presentations. This tip shows how to create an excellent presentation using an unconventional type of circular four steps diagram.

For the illustration of the complex organizational structure, you might think about using a Jigsaw puzzle. At first glance, pieces of Jigsaw puzzle look extremely complex, but this isn't true, and you will need a few simple steps to create an impressive Jigsaw puzzle chart.

If you have mastered simple Jigsaw puzzle pieces (see How to create simple Jigsaw pieces using PowerPoint shapes) and 2-D realistic pieces (see How to create 2D realistic Jigsaw pieces using PowerPoint shapes), you are ready to create 3-D realistic pieces. This will give you a presentation look of professional graphical designer work.

Using PowerPoint union and subtract operations, you can create basic Jigsaw puzzle pieces in a few minutes (see How to create simple Jigsaw pieces using PowerPoint shapes), but if you want them to look close to the real ones, you will need to master re-shaping tricks.

Currently, templates with Jigsaw puzzles are very popular on the Internet. Some of them are pretty expensive, but creating your own Jigsaw puzzle piece won't take a lot of time.

If you show historical data, it is often more informative to create a timeline chart. Several different predefined SmartArt graphics can be used for timeline charts.
This tip shows simple steps for creating a simple and informative timeline using data for Microsoft logo design changes (see https://en.wikipedia.org/wiki/Microsoft#Logo).

PowerPoint proposes a lot of predefined SmartArt graphics, which can help to create your perfect presentation. Sure, all predefined graphics can be modified, but some modifications don't work correctly. This tip shows simple steps that can help you to modify SmartArt graphics.

If you want to stress on the cyclic nature in a diagram, schema or chart will be useful to create circling arrows or arrows in a circle and use them for the background picture.
PowerPoint proposes several predefined features for circular diagrams such as SmartArt, and you can find plenty of them on the Internet. However, it is easy to create your own diagram that will give your presentation a professional look.