Here is a scale drawing of an office floor. The scale is 1 cm to 2.5 m.

A desk is going to be placed in the office. The desk must be closer to AB AB\,AB than ADADAD. The desk must be less than 10 m from CCC.
Shade the region where the desk can be placed.
134 exam-style questions on AQA GCSE Maths Loci and Construction. Each one has a worked solution and a mark scheme showing where the marks go.