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As it was built in nearby Filton - where Concorde was designed and built - it was very much in keeping with their local plane angle too, he said.

Definition 8 states, “A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line.”

A plane angle is the inclination to each other of two lines in a plane which meet each other and do not lie in a straight line.

If a solid angle be contained by three plane angles, any two of them are together greater than the third.

A solid angle is that which is made by more than two plane angles meeting in one point and not lying in the same plane, as the angle of a cube.