iPad Screenshots


The app is designed for high school mathematics students to investigate the properties of angles in circles.

By dragging the points on the interactive diagrams you will explore and gain an understanding of:

- The angle subtended from a diameter.
- Angles subtended from the same arc.
- The angle subtended from an arc at the centre of the circle.
- Angles in cyclic quadrilaterals.
- The alternate segment theorem.

The dynamic diagrams and in-built testing make this an essential app for anyone who is studying or revising for their high school mathematics qualification.

What’s New

Version 1.3

Bug fixes and improvements

Ratings and Reviews

Sums fan ,

Super App!!

This App allows pupils to see the circle theorems in action. Even difficult to visualise cases like the alternate segment theorem are mastered with ease. The quiz gives an excellent opportunity to discuss the theorems and consolidate knowledge and logical thinking. A must have for Maths teachers.

(:smileey ,

Good ... But ...

Really good app so easy to use, but it doesn't explain how the circle theorems work, or the rule (which you need to know for an exam) so for five stars if you could include an explanation of the theorem rules it would be a class app!

Fibonacci_112358 ,

Test results aren't accurate

This is great for persuading my students that the rules apply. However, the test needs looking into. The answers aren't all correct!!!


Pyramid Programming Ltd
24.3 MB
Requires iOS 6.0 or later. Compatible with iPad.
Age Rating
Rated 4+
© 2012 Graeme Fee


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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