Relfe brothers' Euclid sheets, propositions 1-26, book 1

adjacent angles angle contained angle is equal angle is greater angle Wherefore base is equal BOOK BROTHERS EUCLID SHEETS called CHARTERHOUSE BUILDINGS common cut off equal demonstrated describe the circle describe the equilateral distance describe divide draw a straight draw the straight drawn ends equal angles equal sides equilateral triangle exterior angle extremity given point given rectilineal angle given straight line greater angle greater side impossible included angle interior and opposite interior opposite angles join let be greater line RELFE BROTHERS LONDON manner meeting namely point shall coincide possible PROPOSITIONS 1–26 proved equal PUBLISHED RELFE BROTHERS EUCLID remaining angles required to draw right angles shewn side is greater sides are equal sides are opposite sides be produced sides equal SIMILAR FORM straight line RELFE straight lines cut take any point terminated third angle third side three angles triangle are greater triangle is equal vertex wherefore the angle Wherefore the straight