## 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 ... |

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### 多く使われている語句

ABCD base centre chord circle circle ABC circles cut circumference common contained determine diameter distance divided draw draw any line duplicate ratio equal equiangular Eucl extremities figure given angle given circle given in position given line given point given ratio greater half intercepted Join AE less Let ABC let fall line given line joining line required lines be drawn lines drawn manner mean proportional meeting opposite side parallel to BC parallelogram passes pendicular perpendicular placed point of bisection point of contact point of intersection produced quadrant radius right angles segments semicircle shewn similar squares straight line tangent trapezium triangle triangle ABC whence

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124 ページ - If a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those sides produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight '.line which joint the points of section, shall be parallel to the remaining side of the triangle.

xiii ページ - 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.

158 ページ - 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...

160 ページ - Upon a given straight line, to describe a segment of a circle, containing an angle equal to a given angle. Let AB be the given straight line, and C the given angle ; it is required to.

230 ページ - To describe an isosceles triangle, having each of the angles at the base double of the third angle.

157 ページ - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.

33 ページ - FC ; (ax. 1.) and FA, FB, 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.

xxv ページ - ... the squares of the diagonals, is equal to the sum of the squares of the bisected sides together with four times the square of the line joining those points of bisection.

248 ページ - If an equilateral triangle be inscribed in a circle, and the adjacent arcs cut off by two of its sides be bisected, the line joining the points of bisection shall be trisected by the sides.

355 ページ - The sine of an angle is equal to the sine of its supplement. The sine rule Consider fig.