Elements of Geometry, Conic Sections, and Plane TrigonometryHarper & Bros., 1877 - 443 σελίδες |
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Αποτελέσματα 1 - 5 από τα 67.
Σελίδα 25
... bisecting the vertical angle of an isosceles triangle bisects the base at right angles ; and , converse- ly , the line bisecting the base of an isosceles triangle at right an- gles bisects also the vertical angle . Cor . 2. Every ...
... bisecting the vertical angle of an isosceles triangle bisects the base at right angles ; and , converse- ly , the line bisecting the base of an isosceles triangle at right an- gles bisects also the vertical angle . Cor . 2. Every ...
Σελίδα 26
... bisecting the angle FDG , and meeting EG in H , and join FH . Now , because the angle FDH is equal to the angle GDH , also DG is equal to DF , and DH is common to the two triangles FDH , GDH , therefore FH is equal to GH ( Pr . 6 ) ...
... bisecting the angle FDG , and meeting EG in H , and join FH . Now , because the angle FDH is equal to the angle GDH , also DG is equal to DF , and DH is common to the two triangles FDH , GDH , therefore FH is equal to GH ( Pr . 6 ) ...
Σελίδα 39
... bisect each other . Let ABCD be a parallelogram , whose diago- A nals AC , BD intersect each other in E ; then will AE be equal to EC , and BE to ED . D E B Because the alternate angles ABE , EDC are equal ( Pr . 23 ) , and also the ...
... bisect each other . Let ABCD be a parallelogram , whose diago- A nals AC , BD intersect each other in E ; then will AE be equal to EC , and BE to ED . D E B Because the alternate angles ABE , EDC are equal ( Pr . 23 ) , and also the ...
Σελίδα 55
... bisects the chord , and also the arc which it subtends . Let ABG be a circle , of which AB is a chord , and GE a diameter perpendicular to it ; the chord AB will be bisected ... bisects the line AB at right angles , it bisects BOOK III . 55.
... bisects the chord , and also the arc which it subtends . Let ABG be a circle , of which AB is a chord , and GE a diameter perpendicular to it ; the chord AB will be bisected ... bisects the line AB at right angles , it bisects BOOK III . 55.
Σελίδα 56
Elias Loomis. bisects the line AB at right angles , it bisects also the vertical angle ACB ( B. I. , Pr . 10 , Cor . 1 ) ... bisect these lines by the perpendiculars DF , E F ; DF and EF produced will meet one another . For , join DE ; then ...
Elias Loomis. bisects the line AB at right angles , it bisects also the vertical angle ACB ( B. I. , Pr . 10 , Cor . 1 ) ... bisect these lines by the perpendiculars DF , E F ; DF and EF produced will meet one another . For , join DE ; then ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD altitude angle ABC angle ACB angle BAC base bisect centre centre of symmetry chord circle circumference cone conjugate conjugate hyperbola Cosine Cotang curve described diagonals diameter directrix distance divided draw ellipse equal to AC equilateral equivalent figure foci frustum given angle given line given point given straight line greater half Hence hyperbola hypothenuse inscribed intersection join latus rectum less Let ABC line drawn logarithm major axis meet multiplied number of sides ordinate parabola parallel to BC parallelogram parallelopiped perimeter perpendicular plane MN polyedron prism produced projection Prop PROPOSITION pyramid quadrant quadrilateral radical axis radii radius ratio rectangle regular polygon right-angled triangle Scholium secant segment side AC similar sine solid angle sphere spherical square subtangent symmetrical Tang tangent THEOREM transverse axis triangle ABC vertex vertices
Δημοφιλή αποσπάσματα
Σελίδα 68 - Any two rectangles are to each other as the products of their bases by their altitudes.
Σελίδα 35 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Σελίδα 187 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC...
Σελίδα 64 - BEC, taken together, are measured by half the circumference ; hence their sum is equal to two right angles.
Σελίδα 71 - 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.
Σελίδα 23 - 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.
Σελίδα 20 - 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.
Σελίδα 124 - The area of a circle is equal to the product of its circumference by half the radius.* Let ACDE be a circle whose centre is O and radius OA : then will area OA— ^OAxcirc.
Σελίδα 177 - THEOREM. The sum of the sides of a spherical polygon, is less than the circumference of a great circle. Let...
Σελίδα 27 - 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.