Prev 1 of 1 Next Cyclic quadrilateral Circle theorem proof - Maths GCSE Revision Lesson. (Maths-School) Cyclic quadrilateral Circle theorem proof - Maths GCSE Revision Lesson. (Maths-School) A video explaining the proof of the Circle theorem that opposite angles in a cyclic quadrilateral add up to 180 degrees for HIgher GCSE Maths. Watch the video, take notes, subscribe, then go to our website for some practice... Please visit https://maths-school.co.uk for more revision Subscribe to our channel for more revision content coming soon - click here: https://bit.ly/2Y3ggGh Prev 1 of 1 Next Post navigation Understand how to solve more complex vector problems Use the cosine rule to solve 2D problems