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Algebraically Altitude angles appears apply axes base bisect Book XI centre Circumscribing common compounded condition construction contained Deductions definition demonstration describe diameter distance divided draw drawn equal equimultiples Euclid evident extremities fall figure follows four Geometrical give given greater Hence inclined inscribed intersection join less Limitation magnitude means meet multiple necessary opposite passing placed plane polygon position Problem produced proof Prop proportionals proposition Prove quantities Radius ratio reason regular respectively right angles segment shew shewn sides similar Similarly solid Solutions space Sphere straight line student subtended supposed Surface taken tangent third touching triangle vertices Volume whole
Pagina 9 - If two triangles have two sides of the one equal to two sides of the...
Pagina 21 - Geometry, printed anno 1760, observes in his notes, that it ought to have been shewn, that the point F falls below the line EG. This probably Euclid omitted, as it is very easy to perceive, that DG being equal to DF, the point G is in the circumference of a circle described from the centre D at the distance DF, and must be in that part of it which is above the straight line EF, because DG falls above DF, the angle EDG being greater . than the angle EDF.
Pagina 71 - Ratio is the relation which one quantity bears to another in respect of magnitude, the comparison being made by considering what multiple, part, or parts, one is of the other.
Pagina 8 - For, if the triangle ABC be applied to DEF, so that the point A may be on D, and the straight line AB upon DE ; the point B shall coincide with the point E...
Pagina 9 - Two triangles are equal, when the three sides of the one are equal to the three sides of the other, each to each.
Pagina 20 - Of the two sides DE, DF, let DE be the side which is not greater than the other, and at the point D, in the straight line DE, make (i.
Pagina 49 - The perpendicular is the shortest straight line that can be drawn from a given point to a given straight line; and of others, that which is nearer to the perpendicular is less than the more remote; and two, and only two, equal straight lines can be drawn from the given point to the given straight line, one on each side of the perpendicular.
Pagina 24 - Two straight lines which intersect one another cannot be both parallel to the same straight line.