Chauvenet's Treatise on Elementary Geometry |
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Page 49
... radius of symmetry . A point A is brought into Ar coincidence with its symmetrical point A ' , by revolving its radius OA through two right angles ( 16 ) . 139. Definition . Any two figures are symmetrical with respect to a centre ...
... radius of symmetry . A point A is brought into Ar coincidence with its symmetrical point A ' , by revolving its radius OA through two right angles ( 16 ) . 139. Definition . Any two figures are symmetrical with respect to a centre ...
Page 53
... radius ; and every point without the circle is at a distance from the centre which is greater than the radius . Hence ( I. 40 ) , the locus of all the points in a plane which are at a given distance from a given point is the ...
... radius ; and every point without the circle is at a distance from the centre which is greater than the radius . Hence ( I. 40 ) , the locus of all the points in a plane which are at a given distance from a given point is the ...
Page 60
... radius OC drawn to that point . For , if it were not perpendicular to the radius it would cut the circumference ( 25 ) , and would not be a tangent . A E F B 28. Scholium . If a secant EF , passing through a point C of the circumference ...
... radius OC drawn to that point . For , if it were not perpendicular to the radius it would cut the circumference ( 25 ) , and would not be a tangent . A E F B 28. Scholium . If a secant EF , passing through a point C of the circumference ...
Page 60
... radius OC drawn to that point . For , if it were not perpendicular to the radius it would cut the circumference ( 25 ) , and would not be a tangent . A E F ' B 28. Scholium . If a secant EF , passing through a point C of the ...
... radius OC drawn to that point . For , if it were not perpendicular to the radius it would cut the circumference ( 25 ) , and would not be a tangent . A E F ' B 28. Scholium . If a secant EF , passing through a point C of the ...
Page 60
... radius drawn perpendicular to the parallels . By Prop . VII . the point M is at once the middle of the arc AMB and of the arc CMD , and hence we have G N H AM = BM and CM = DM , whence , by subtraction , that is , AM - CM - BM - DM ...
... radius drawn perpendicular to the parallels . By Prop . VII . the point M is at once the middle of the arc AMB and of the arc CMD , and hence we have G N H AM = BM and CM = DM , whence , by subtraction , that is , AM - CM - BM - DM ...
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Common terms and phrases
ABCD adjacent angles allel angle AOB angle BAC angles are equal apothem arc AC BC² bisector bisects called centre chord circum circumference coincide Corollary Definition diagonals diameter dicular distance divided draw equal angles equally distant exterior angle ference figure four right angles geometry given angle given point given straight line greater hence homologous sides hypotenuse inscribed inscribed angle intercepted arcs less Let ABC measured by one-half middle point number of sides oblique lines one-half the arc opposite sides parallel to BC parallelogram pendicular perimeter perpen perpendicular points of intersection produced proportion PROPOSITION quadrilateral quantities radii radius ratio rectangle regular polygon rhombus right angles right triangles Scholium secant line segment semi-circumference side AC sides are equal square straight line drawn symmetrical with respect tangent theorem triangle ABC triangles are equal vertex
Popular passages
Page 201 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
Page 31 - The perpendicular is the shortest line that can be drawn from a point to a straight line. Let PC be the perpendicular, and PD any oblique line, from the point P to the line AB. Then PC < PD. For, produce PC to P', making CP
Page 201 - Words, Facts, and Phrases : A Dictionary of Curious, Quaint, and Out-of-the-Way Matters. By ELIEZER EDWARDS.
Page 120 - Any side of a spherical triangle is less than the sum of the other two.
Page 81 - A truncated triangular prism is equivalent to the sum of three pyramids whose common base is the base of the prism, and whose vertices are the three vertices of the inclined section.
Page 92 - Every point in the bisector of an angle is equally distant from the sides of the angle...
Page 58 - An angle formed by a tangent and a chord is measured by one-half the intercepted arc.