## Elements of Geometry (Google eBook) |

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### Common terms and phrases

ABCD adjacent angles algebraical alternate angles angle ABC angle BA angle BCD angle contained angle equal axiom base BC BC is equal bisected circle definition demonstrated diagonals difference double equal angles equal to AC equal to twice equilateral triangle Euclid Euclid's Elements exterior angle Geometrical given line given point given straight line gnomon greater hypotenuse interior and opposite intersection isosceles triangle join less line be divided line CD linear units lines be drawn magnitude meet opposite angles opposite sides parallel straight lines parallel to BC parallelogram perpendicular porism problem produced Prop proposition proved quadrilateral quadrilateral figure rectangle BC rectangle contained remaining angle rhombus right angles right-angled triangle segments shew shewn side BC sides equal square described square on AC squares on AB THEOREM trapezium triangle ABC triangles are equal twice the rectangle unequal vertex