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Books Books 51 - 51 of 51 on AB, CD. In like manner, it may be proved, that FE makes right angles with every straight....  
" AB, CD. In like manner, it may be proved, that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane when it makes right angles with every straight line which meets it in that plane... "
Books 10-13 and appendix - Page 279
by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908
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The Cambridge Series for School and Training Colleges , Geometrical Drawing

...dihedral angle is that made by the under surface of the HP and the front surface of the VP (202). * A straight line is at right angles to a plane, when it is at right angles to every straight line in the plane that passes through their point of section....
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