Angle, Measures and Ratio Excel spreadsheets

Reusable mixed ability spreadsheets for Excel / Open Office covering finding angles around lines, in triangles and rectangles using knowledge of the degrees in a straight line, right-angle, triangle and circle. I.W.B. versions with working models to demonstrate changing angles and how one impacts an angle elsewhere in the model. All sheets can be reused time and again with the press of the F9 key to generate new numbers with answers (can be displayed on I.W.B. for self-marking and repeated demonstration) and print to A4 to allow as much practice as required with additional sheets for lessons or extra homework practice.