Elements of Geometry and Conic Sections |
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Page 15
... angles CBE , DBE be a right angle . Now the angle CBA is equal to the sum of the two angles CBE , EBA . To each of ... BAC , CAD , DAE , EAF , formed on the same side of the line BF , is equal to two right c . angles ; for their sum is ...
... angles CBE , DBE be a right angle . Now the angle CBA is equal to the sum of the two angles CBE , EBA . To each of ... BAC , CAD , DAE , EAF , formed on the same side of the line BF , is equal to two right c . angles ; for their sum is ...
Page 19
... angle B be equal to the angle C. D For , conceive the angle BAC to be bisected by the straight line AD ; then , in the two trian- gles ABD , ACD , two sides AB , AD , and the in- cluded angle in the one , are equal to the two B sides AC ...
... angle B be equal to the angle C. D For , conceive the angle BAC to be bisected by the straight line AD ; then , in the two trian- gles ABD , ACD , two sides AB , AD , and the in- cluded angle in the one , are equal to the two B sides AC ...
Page 21
... angle , will be greater than the base of the other . AA Let ABC , DEF be two trian- gles , having two sides of the one equal to two sides of the other , viz . AB equal to DE , and AC to DF , but the angle BAC greater than the angle EDF ...
... angle , will be greater than the base of the other . AA Let ABC , DEF be two trian- gles , having two sides of the one equal to two sides of the other , viz . AB equal to DE , and AC to DF , but the angle BAC greater than the angle EDF ...
Page 22
... angle BAC be greater than the angle EDF . B C F For if it is not greater , it must be either equal to it , or less . But the angle BAC is not equal to the angle EDF , because then the base BC would be equal to the base EF ( Prop . VI ...
... angle BAC be greater than the angle EDF . B C F For if it is not greater , it must be either equal to it , or less . But the angle BAC is not equal to the angle EDF , because then the base BC would be equal to the base EF ( Prop . VI ...
Page 27
... angles ABD and BAC is equal to two right an- gles . Therefore , the sum of ABD and ABF is equal to the sum of ABD and BAC . Take away the common angle ABD , and the remainder , ABF , is equal to BAC ; that is GBF is equal to GAE . Again , ...
... angles ABD and BAC is equal to two right an- gles . Therefore , the sum of ABD and ABF is equal to the sum of ABD and BAC . Take away the common angle ABD , and the remainder , ABF , is equal to BAC ; that is GBF is equal to GAE . Again , ...
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Common terms and phrases
ABCD AC is equal allel altitude angle ABC angle ACB angle BAC base BCDEF bisected chord circle circumference cone convex surface curve described diagonals diameter draw ellipse equal angles equal to AC equally distant equiangular equilateral equivalent exterior angle foci four right angles frustum given angle given point greater hyperbola hypothenuse inscribed intersect join latus rectum Let ABC lines AC Loomis major axis mean proportional measured by half meet number of sides ordinate parabola parallelogram parallelopiped pendicular perimeter perpen perpendicular plane MN prism Professor of Mathematics PROPOSITION pyramid radii radius ratio rectangle regular polygon right angles Prop Scholium segment side AC similar similar triangles slant height solid angle sphere spherical triangle square subtangent tangent THEOREM triangle ABC vertex vertices
Popular passages
Page 60 - Any two rectangles are to each other as the products of their bases by their altitudes.
Page 17 - If two triangles have two sides, and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal, their third sides will be equal, and their other angles will be equal, each to each.
Page 101 - When you have proved that the three angles of every triangle are equal to two right angles...
Page 63 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the' rectangle contained by the parts.
Page 18 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.
Page 10 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Page 32 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 37 - Proportional, when the ratio of the first to the second is equal to the ratio of the second to the third.
Page 15 - Wherefore, when a straight line, &c. QED PROP. XIV. THEOR. If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Page 44 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.