Geometrical Problems Deducible from the First Six Books of Euclid, Arranged and Solved: To which is Added an Appendix Containing the Elements of Plane Trigonometry ...J. Smith, 1819 - 377 sider |
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Side xvii
... triangle perpendiculars be drawn to the sides ; they are together equal to a perpendicular drawn from any of the angles to the opposite side . 4. If the points of bisection of the sides of a given triangle be joined ; the triangle so formed ...
... triangle perpendiculars be drawn to the sides ; they are together equal to a perpendicular drawn from any of the angles to the opposite side . 4. If the points of bisection of the sides of a given triangle be joined ; the triangle so formed ...
Side xviii
... triangles having the same vertical angle , and whose bases pass through a given point , the least is that whose base is bisected in the given point . 13. If from the angles at the base of a triangle , perpendiculars be let fall on a ...
... triangles having the same vertical angle , and whose bases pass through a given point , the least is that whose base is bisected in the given point . 13. If from the angles at the base of a triangle , perpendiculars be let fall on a ...
Side xix
... given triangle to draw a line parallel to one of the sides , so that it may be a mean proportional between the ... given ratio . 24. If the base of a triangle be produced so that the whole may be to the part produced in the duplicate ...
... given triangle to draw a line parallel to one of the sides , so that it may be a mean proportional between the ... given ratio . 24. If the base of a triangle be produced so that the whole may be to the part produced in the duplicate ...
Side xx
... given line , be drawn to the opposite sides ( produced if necessary ) ; and from any point within , lines be drawn parallel to these , and meeting the sides of the triangle ... angle of a triangle , a XX CONTENTS .
... given line , be drawn to the opposite sides ( produced if necessary ) ; and from any point within , lines be drawn parallel to these , and meeting the sides of the triangle ... angle of a triangle , a XX CONTENTS .
Side xxi
... triangle , a line be drawn inter- secting that which joins the vertex and the bisection of the base , the opposite ... given ratio to the part cut off by the opposite side . 39. To determine that point in the base produced of a right- angled ...
... triangle , a line be drawn inter- secting that which joins the vertex and the bisection of the base , the opposite ... given ratio to the part cut off by the opposite side . 39. To determine that point in the base produced of a right- angled ...
Indhold
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Almindelige termer og sætninger
ABCD angle ABC angles at F base centre chord circle ABC circles cut circles touch circumference describe a circle divided draw a line draw the diameter drawn parallel duplicate ratio equal angles equiangular Eucl extremities G draw given angle given circle given in position given line given point given ratio given square given straight line given triangle intercepted isosceles triangle Join AE Join BD Let AB Let ABC let fall line given line joining line required lines be drawn lines drawn mean proportional opposite side parallel to BC parallelogram pendicular point of bisection point of contact point of intersection point required radius rectangle right angles segments semicircle shewn tangent touching the circle trapezium triangle ABC
Populære passager
Side 14 - IF a straight line be divided into two equal, and also into two unequal parts ; the squares of the two unequal parts are together double of the square of half the line, and of the square of the line between the points of section.
Side xiii - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle,. shall be equal to the square of the line which touches it.
Side 230 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Side 327 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Side 158 - Iff a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other...
Side 212 - FC are equal to one another : wherefore the circle described from the centre F, at the distance of one of them, will pass through the extremities of the other two, and be described about the triangle ABC.
Side 123 - If from a point, without a parallelogram, there be drawn two straight lines to the extremities of the two opposite sides, between which, when produced, the point does not lie, the difference of the triangles thus formed is equal to half the parallelogram. Ex. 2. The two triangles, formed by drawing straight lines from any point within a parallelogram to the extremities of its opposite sides, are together half of the parallelogram.
Side 305 - Given the vertical angle, the difference of the two sides containing it, and the difference of the segments of the base made by a perpendicular from the vertex ; construct the triangle.
Side 247 - The perpendicular from the vertex on the base of an equilateral triangle is equal to the side of an equilateral triangle inscribed in a circle, whose diameter is the base.
Side 299 - AB be equal to the given bisecting line ; and upon it describe a segment of a circle containing an angle equal to the given angle.