More Lessons for GCSE Maths
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.
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.