Inside a circle, the angle at the centre is always twice the angle at the circumference.

Circle Theorems: Angle at the centre

Circle Theorems: Angle in a semi-circle

Circle Theorems: Cyclic Quadrilateral

Circle Theorems: Same Segment

Circle Theorems: Alternate Segment

Area of Circles

Arc Length

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The content has been developed together with teachers and pedagogues and is based on research. You can start from your own level of knowledge and choose exactly the area you need to practice.

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For each area there are several explanatory videos that cleverly go through the rules and examples. In addition, there is a function that gives the child tips if he gets stuck on a task.