## Theoretical Geometry: Based on the Various Geometry Books by Godfrey and Siddons |

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altitude base BC bisector bisects called centre chord circle circumference common tangent congruent constant Construction contained converse corresponding described diagonals diameter distance divided draw drawn drawn parallel edges equal equiangular equilateral triangle equivalent externally falls figure fixed point formed four Geometry given given point given straight line Hence inscribed internally intersect isosceles triangle length line is drawn line joining locus mean measured meet mid-point NOTE opposite sides pair parallel parallelogram pass perpendicular plane polygon produced Proof proportional Prove quadrilateral quadrilateral ABCD radii radius ratio rectangle respectively right angles segment Show similar square straight line subtends taken THEOREM triangle ABC units vertex vertices