The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh and Twelfth ... Also the Book of Euclid's Data, in Like Manner Corrected |
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Seite 40
To describe a square upon a given straight line . Let AB be the given straight line ; It is required to describe a square upon AB . From the point A draw a AC at right angles to AB ; and 13.1 . makeb AD equal to AB , and through the ...
To describe a square upon a given straight line . Let AB be the given straight line ; It is required to describe a square upon AB . From the point A draw a AC at right angles to AB ; and 13.1 . makeb AD equal to AB , and through the ...
Seite 41
1 . same base BD , and between the same parallels BD , AL ; and the square GB is double of the triangle FBC , because these also are upon the same base FB , and between the same parallels FB , GC . But the doubles of equals are equal h ...
1 . same base BD , and between the same parallels BD , AL ; and the square GB is double of the triangle FBC , because these also are upon the same base FB , and between the same parallels FB , GC . But the doubles of equals are equal h ...
Seite 42
If the square described upon BC , one of the sides of the triangle ABC , be equal to the squares upon the other sides BA , AC , the angle BAC is a right angle . From the point A drawa AD at right angles to AC , and make AD equal to BA ...
If the square described upon BC , one of the sides of the triangle ABC , be equal to the squares upon the other sides BA , AC , the angle BAC is a right angle . From the point A drawa AD at right angles to AC , and make AD equal to BA ...
Seite 44
Ir a straight line be divided into any two parts , the rectangles contained by the whole and each of the parts , are together equal to the square of the whole line . Let the straight line AB be divided A. C B into any two parts in the ...
Ir a straight line be divided into any two parts , the rectangles contained by the whole and each of the parts , are together equal to the square of the whole line . Let the straight line AB be divided A. C B into any two parts in the ...
Seite 45
Boor ll . angle contained by AB , AC , together with the rectangle AB , BC , is equal to the square of AB . If therefore a straight line , & c . Q. E.D. PROP . III . THEOR . a 46 1 . Ir a straight line be divided into any two parts ...
Boor ll . angle contained by AB , AC , together with the rectangle AB , BC , is equal to the square of AB . If therefore a straight line , & c . Q. E.D. PROP . III . THEOR . a 46 1 . Ir a straight line be divided into any two parts ...
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Seite 41 - 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.
Seite 180 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Seite 166 - Equiangular parallelograms have to one another the ratio which is compounded of the ratios of their sides. Let AC, CF be equiangular parallelograms having the angle BCD equal to the angle ECG ; the ratio of the parallelogram AC to the parallelogram CF is the same with the ratio which is compounded •f the ratios of their sides. DH Let BC, CG be placed in a straight line ; therefore DC and CE are also in a straight line (14.
Seite 2 - A rhomboid, is that which has its opposite sides equal to one another, but all its sides are not equal, nor its angles right angles.
Seite 105 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any equimultiples whatsoever of the first and third being taken, and any equimultiples whatsoever of the second and fourth ; if the multiple of the first be less than that of the second, the multiple of the third is also less than that of the fourth...
Seite 79 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Seite 1 - A straight line is that which lies evenly between its extreme points.
Seite 149 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Seite 23 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Seite 83 - Wherefore from the given circle ABC has been cut off the segment BAC, containing an angle equal to the given angle DQEP PROP. XXXV. THEOR. If two straight lines within a circle cut one another, the rectangle contained by the segments of one of them is equal to the rectangle contained by the segments of the other. Let the...