Elements of Geometry and Trigonometry: With Practical Applications |
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Page 17
... hence two straight lines which have two points common , A and B , cannot separate from each other when produced ; hence they must form one and the same straight line . PROPOSITION IV . THEOREM . - C 49. When two straight lines intersect ...
... hence two straight lines which have two points common , A and B , cannot separate from each other when produced ; hence they must form one and the same straight line . PROPOSITION IV . THEOREM . - C 49. When two straight lines intersect ...
Page 19
... Hence the point A , falling at the same time in both of the straight lines E D and FD , must fall at their intersection , D. Hence the two triangles ABC , DEF coincide with each other , and are therefore equal ( Art . 34 , Ax . 14 ) ...
... Hence the point A , falling at the same time in both of the straight lines E D and FD , must fall at their intersection , D. Hence the two triangles ABC , DEF coincide with each other , and are therefore equal ( Art . 34 , Ax . 14 ) ...
Page 20
... hence the two triangles are equal , and the angle B is equal to the angle C ( Prop . V. ) . 57. Cor . 1. The line bisecting the vertical angle of an isosceles triangle bisects the base at right angles . 58. Cor . 2. Conversely , the ...
... hence the two triangles are equal , and the angle B is equal to the angle C ( Prop . V. ) . 57. Cor . 1. The line bisecting the vertical angle of an isosceles triangle bisects the base at right angles . 58. Cor . 2. Conversely , the ...
Page 24
... hence no more than one perpendicular can be drawn from the same point to the same straight line . 71. Cor . At the same point C , in the line AB , it is likewise impossible to erect more than one perpendicular to that line . For , if CD ...
... hence no more than one perpendicular can be drawn from the same point to the same straight line . 71. Cor . At the same point C , in the line AB , it is likewise impossible to erect more than one perpendicular to that line . For , if CD ...
Page 25
... hence the third sides , CF and A C , are equal ( Prop . V. Cor . ) . But ABF , being a straight line , is shorter than ACF , which is a broken line ( Art . 34 , Ax . 10 ) ; therefore AB , the half of ABF , is shorter than A C , the half ...
... hence the third sides , CF and A C , are equal ( Prop . V. Cor . ) . But ABF , being a straight line , is shorter than ACF , which is a broken line ( Art . 34 , Ax . 10 ) ; therefore AB , the half of ABF , is shorter than A C , the half ...
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Common terms and phrases
A B C ABCD adjacent angles altitude angle equal base bisect centre chord circle circumference circumscribed cone convex surface cosec cosine Cotang cylinder diagonal diameter distance divided drawn equal Prop equilateral triangle equivalent exterior angle feet formed frustum gles greater half the sum hence homologous hypothenuse inches included angle inscribed less Let ABC line A B logarithm logarithmic sine mean proportional measured by half multiplied number of sides parallel parallelogram parallelopipedon pendicular perimeter perpendicular polyedron prism PROBLEM PROPOSITION pyramid quadrantal radii radius ratio rectangle regular polygon right angles right-angled triangle rods Scholium secant segment side A B similar sine slant height solidity solve the triangle sphere spherical polygon spherical triangle Tang tangent THEOREM triangle ABC triangle equal trigonometric functions vertex
Popular passages
Page 35 - 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 57 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Page 117 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.
Page 50 - If any number of magnitudes are proportional, any antecedent is to its consequent as the sum of all the antecedents is to the sum of all the consequents. Let A : B : : C : D : : E : F; then will A : B : : A + C + E : B + D + F.
Page 77 - Two rectangles having equal altitudes are to each other as their bases.
Page 158 - If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines.
Page 313 - FRACTION is a negative number, and is one more tftan the number of ciphers between the decimal point and the first significant figure.
Page 314 - The logarithm of any POWER of a number is equal to the product of the logarithm of the number by the exponent of the power. For let m be any number, and take the equation (Art.
Page 100 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Page 244 - RULE. — Multiply the base by the altitude, and the product will be the area.