Or a Fibonacci sequence!

Seems more logical to me to duplicate the trapezium to form a rectangle, rather than split it into triangles.

An air flier?

Multiply your sentence through by four: one is three!

Sounds like this from Geoff Faux / ATM - fabulous resource: atm.org.uk/Shop/KS4/Exp...

A Pair of Briefs Encounter

A Pair of Briefs Encounter

I really like how this initially feels like you don’t have the right information to work it out, but leads to a pleasing link between area and perimeter

… until they’re not there anymore to ask for help and you would like nothing better than to fix the printer one more time.

Midpoint of AC forms 3,4,5 triangle and is 5 units from B, so angle in semi-circle

There was a nice task in the old Folens scheme that asked students to construct triangles when given different angles / sides - including ambiguous cases, looking for congruence and similarity

I agree, but there has always been the tension for me between the restrictions of following a text book and the flexibility of worksheets with the accompanying costs ( time, printing etc). Booklets allow a pick and mix approach eg the OAT resources and also give some consistency across a department

Are booklets more prevalent in other subjects and have been introduced to maths as a result?

I've dabbled with booklets but only for a week or two's work, particularly when there's write-on worksheets that I know I'm going to use. Planning a sequence of lessons is always helpful but there has to be flexibility so that you can adapt to your pupils.