Practice questions can be found here: https://mathskitchen.com/?utm_source=YouTube&utm_medium=descriptionlink&utm_campaign=circletheoremfull
Circle theorems questions come up frequently in the Higher GCSE Maths exam and when they do come up they're often worth quite a few marks. So if you are aiming for a high grade in your GCSE maths it's well worth getting to grips with them and including them as part of your revision.
Here are the timings if you need to skip to a particular circle theorem.
0:48 The language of circles and circle theorems.
2:45 The angle at the centre is twice the angle at the circumference.
3:56 Angles in the same segment are equal.
5:36 The angle in a semicircle is a right angle.
6:46 Opposite angles in a cyclic quadrilateral sum to 180 degrees.
7:54 The angle between a tangent and a radius is always 90 degrees
8:36 Tangents that meet at a point are equal in length.
9:35 Alternate segment theorem
11:03 Isosceles triangles in circles
12:25 Tips and tricks for answering circle theorem questions.
Thanks for watching - any questions or suggestions for future videos let me know in the comments below.
James