Hexagon of the circumscribed circle, which equals formula_1 times the apothem (radius of the inscribed circle). All internal angles are 120 degrees. A regular hexagon has 6 rotational symmetries ("rotational symmetry of order six") and 6 reflection symmetries ("six lines of symmetry"), making up the dihedral group D. The longest diagonals of a regular hexagon, connecting diametrically opposite vertices, are twice the length of one side. From this it can be seen that a triangle with a vertex at the center of the regular hexagon and sharing one side with the hexagon is equilateral, and that the regular hexagon can be
A Plane Is Born on the Europa's wings and Mark puts his composite skills to the test. In part 2, he continues his flight training as he learns about climbing and descending. Nigel Marshall and Rob Cooper talk about the Pitenphol Air-camper they built at work in their lunch-hours. - You Have Control! Work on the plane continues with the Cockpit module and control yokes. Mark also receives a visit from Neville Eyre, his PFA inspector who checks to see that his work so far is air worthy. Over at Staverton Airport, it's pass the sick bag when he is introduced to "stalling". Finally,