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More Lessons for GCSE Maths

Math Worksheets

Examples, solutions, and videos to help GCSE Maths students learn the circle theorems.

**Circle Theorems 1 **

The angle at the centre is twice the angle at the edge for configurations with intersecting lines.
**Circle Theorem 2 (angle is a semi circle)**

The angle in a semi-circle is always 90 degrees.

**Circle Theorems 3 (Angles in the same arc)**

Angles in the same segment are equal. (Bow theorem)
**Circle Theorems 4 (cyclic quads)**

Opposite angles in a cyclic quadrilateral add up to 180 degrees**The Alternate Segment Theorem**

The angle between a tangent and a chord is equal to the angle in the alternate segment.

More Lessons for GCSE Maths

Math Worksheets

Examples, solutions, and videos to help GCSE Maths students learn the circle theorems.

The angle at the centre is twice the angle at the edge for configurations with intersecting lines.

The angle in a semi-circle is always 90 degrees.

Angles in the same segment are equal. (Bow theorem)

Opposite angles in a cyclic quadrilateral add up to 180 degrees

The angle between a tangent and a chord is equal to the angle in the alternate segment.

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