@Scot Gould I had forgotten about that. I this you pointed this out to me or something similar about 6 months ago.

@acer I will use the 3rd option. I didn't know about andseq.  Sometimes the matrix elements can grow very large when radicals are involved.

@nm Thank you that works well.

@Christopher2222  That is really useful I am studying rotations SO(3) and I want to investigate to combination of different rotations.

@Christopher2222 Oh. I am aware of that. I was more complaining that a simple plane would require such a huge output to display/plot.

@acer @dharr @Carl Love  "plot3d" with "solve" much better. Yes I see my unthinking use of "display" here is unnecessary.

@dharr  How do I submit a bug report or do Maple pick up the problems directly from these questions?

An nice enhancement from Maple would be to have predefined template sizes A4, A3,.... one could pick from. I  would be inrerested to know how people who write papers manage.

Can this be used with Mple 2024?

@Alfred_F RMB on the plot and select probe info. Would that do?

@Alfred_F Left hand side lhs and Right hand side rhs can be very useful when = is involved.

I'm using Windows 10

@Rouben Rostamian  That is well explained. Vote up. 

@Kitonum I was doing it visually at work on a friday afternoon and using a calculator. I admit my reasoning may be incorrect. What I meant was, if one draws a horizontal line through the center of the parallelogram that would split the blue triangle in half. The top half triangle should be similar to the yellow triangle.

I would stay off it.

@Scot Gould Thank you. I will experiment with that.