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acute angle angle contained angles equal applied bisect Book called centre circumference compounded of ratios conversely DEFINITIONS described diameter divided equal angles equal straight lines equimultiples excess exterior angle extremities fall fifth four magnitudes four straight lines fourth given circle given rectilineal angle given rectilineal figure given straight line greater greater ratio half homologous sides inscribed interior less likewise magnitude taken manifest manner mean multiple obtuse angle opposite parallel parallelogram passes perpendicular polygons prisms PROBLEM produced PROP proportionals PROPOSITIONS pyramids rank ratio compounded reciprocally proportional rectangle contained remaining right angles segment semicircle sides equal similar similarly described sixth solid angles solid figure contained solid parallelopiped sphere square stand straight line drawn superficies tained taken THEOREM thing third three plane angles three straight lines triangle triangular bases triplicate ratio unequal VIII whole whole line XVII XVIII
Strona 8 - IF two triangles have two sides of the one equal to two sides of the...
Strona 6 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Strona 14 - From this it is manifest, that if in a circle a straight line bisect another at right angles, the centre of the circle is in the line which bisects the other.
Strona 23 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any equimultiples whatsoever of the first and third being taken, and any equimultiples whatsoever of the second and fourth ; if the multiple of the first be less than that of the second, the multiple of the third is also less than that of the fourth...
Strona 11 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Strona 13 - angle in a segment' is the angle contained by two straight lines drawn from any point in the circumference of the segment, to the extremities of the straight line which is the base of the segment.
Strona 12 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts, shall be equal to the square on the other part.
Strona 4 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.