A Text-book of Euclid's Elements: For the Use of Schools : Books I-VI and XI |
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ABCD angle equal bisected bisectors centre chord circles intersect circles touch circles which touch circumference circumscribed circle concyclic Constr Describe a circle diagonals diameter draw equal angles equiangular exterior angle find the locus given circle given point given straight line Given the base given triangle greater Hence hypotenuse inscribed circle isosceles triangle Let ABC line which joins meet middle point nine-points circle opposite sides orthocentre par¹ parallelogram parm pedal triangle perp perpendiculars drawn point of contact point of intersection produced PROPOSITION Proposition 21 quadrilateral radii radius ratio rect rectangle contained regular pentagon regular polygon right angles segment semicircle shew shewn Similarly square straight line drawn subtended tangent THEOREM touch a given triangle ABC vertex vertical angle Нур