M M\,M and N N\,N are points on the circumference of a circle, centre OOO.
Angle ONM=55∘ONM = 55^\circONM=55∘
Find the size of angle MONMONMON.
Give a reason for your answer.
59 exam-style questions on Eduqas GCSE Maths Circle Theorems. Each one has a worked solution and a mark scheme showing where the marks go.