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Got it .... Thanks
Now my diagram isn't making sense. Is the lettering A to B to C to D ?
Let CD < AB,
Sorry, it should have been AC² + BD² = BC² + AD² + 2•AB•CD
Let me check....
Not so different. I blunder around plenty but Agnishom is usually careful.
That's the difference between us then. I tend to blunder in and post anyway. I guess that's why my posts are full of corrections.
That's as far as I've got.
You might have a hard time proving that because I have been playing with trapeziums in geogebra and I can not find a single one where that is true.
So I set up the diagram on Sketchpad and got (for my trapezium)
In a trapezium ABCD, if AB||CD then AC² + BD² = BC² + AB² + 2•AB•CD