This is a resource I created for my Year 6 maths set (high ability) which would be suitable for KS3 as well. There are a number of angles which the students have to calculate without measuring, based on rules regarding angles and parallel lines. There are two versions, one with more answers given, and this could be given in class or as a homework task depending on the support required.

The helpsheet contains powerpoint slides taken from a resource published by @dwatson802 called Angles with Parallel and intersecting lines.