The First Six Books of the Elements of Euclid: And Propositions I-XXI of Book XI, and an Appendix on the Cylinder, Sphere, Cone, Etc., with Copious Annotations and Numerous ExercisesHodges, Figgis, & Company, 1885 - 312 σελίδες |
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Αποτελέσματα 1 - 5 από τα 86.
Σελίδα 4
... A point is that which has position but not dimen- sions . A geometrical magnitude which has three dimensions , that is , length , breadth , and thickness , is a solid ; that which has two dimensions , such as length and breadth , is a ...
... A point is that which has position but not dimen- sions . A geometrical magnitude which has three dimensions , that is , length , breadth , and thickness , is a solid ; that which has two dimensions , such as length and breadth , is a ...
Σελίδα 5
... A line which lies evenly between its extreme points is called a straight or right line , such as AB . 66 99 B If a point move without changing its direction it will describe a right line . The direction in which a point moves is called ...
... A line which lies evenly between its extreme points is called a straight or right line , such as AB . 66 99 B If a point move without changing its direction it will describe a right line . The direction in which a point moves is called ...
Σελίδα 15
... points G , F , H are collinear , and the triangle GCH is equi- lateral . 4. If CF be joined , CF2 = 3AB2 . 5. Describe a circle in the space ACB , bounded by the line AB and the two circles . PROP . II . - PROBLEM . From a given point ( A ) ...
... points G , F , H are collinear , and the triangle GCH is equi- lateral . 4. If CF be joined , CF2 = 3AB2 . 5. Describe a circle in the space ACB , bounded by the line AB and the two circles . PROP . II . - PROBLEM . From a given point ( A ) ...
Σελίδα 16
... given point A the line AF has been drawn equal to BC . It is usual with commentators on Euclid to say that he allows the use of the rule and compass . Were such the case this Propo- sition would have been unnecessary . The fact is ...
... given point A the line AF has been drawn equal to BC . It is usual with commentators on Euclid to say that he allows the use of the rule and compass . Were such the case this Propo- sition would have been unnecessary . The fact is ...
Σελίδα 18
... point C shall coincide with F ; and we have proved that the point B coincides with E. Hence two points of the line BC coincide with two points of the line EF ; and since two right lines cannot enclose a space , BC must coincide with EF ...
... point C shall coincide with F ; and we have proved that the point B coincides with E. Hence two points of the line BC coincide with two points of the line EF ; and since two right lines cannot enclose a space , BC must coincide with EF ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD AC is equal adjacent angles altitude angle ABC angle ACB angle BAC angular points Axiom bisector bisects centre chord circles touch circumference circumscribed circle collinear concurrent lines const coplanar cyclic quadrilateral Dem.-Let diagonals diameter divided draw equal angles equal to AC equiangular equilateral triangle escribed circles Euclid Exercises exterior angle Geometry given circle given line given point greater Hence the angle hypotenuse inscribed less line AC line joining locus manner meet middle points multiple nine-points circle opposite sides parallel parallelogram parallelopiped perpendicular plane points of intersection prism PROP Proposition prove radii radius rectangle contained rectilineal figure regular polygon respectively equal right angles right line segments semicircle sides AC similar square on AC tangent theorem triangle ABC vertex vertical angle
Δημοφιλή αποσπάσματα
Σελίδα 299 - Thus the proposition, that the sum of the three angles of a triangle is equal to two right angles, (Euc.
Σελίδα 186 - When of the equimultiples of four magnitudes (taken as in the fifth definition) the multiple of the first is greater than that of the second, but the multiple of the third is not greater than the multiple of the fourth ; then the first is said to have to the second a greater ratio than the third magnitude has to the fourth...
Σελίδα 9 - LET it be granted that a straight line may be drawn from any one point to any other point.
Σελίδα 104 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts, shall be equal to the square on the other part.
Σελίδα 124 - The diameter is the greatest straight line in a circle; and, of all others, that which is nearer to the centre is always greater than one more remote; and the greater is nearer to the centre than the less. Let ABCD be a circle, of which...
Σελίδα 230 - If from any angle of a triangle, a straight line be drawn perpendicular to the base ; the rectangle contained by the sides of the triangle is equal to the rectangle contained by the perpendicular and the diameter of the circle described about the triangle.
Σελίδα 29 - Again ; the mathematical postulate, that " things which are equal to the same are equal to one another," is similar to the form of the syllogism in logic, which unites things agreeing in the middle term.
Σελίδα 63 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Σελίδα 128 - The diagonals of a quadrilateral intersect at right angles. Prove that the sum of the squares on one pair of opposite sides is equal to the sum of the squares on the other pair.
Σελίδα 22 - ACB, DB is equal to AC, and BC common to both ; the two sides DB, BC, are equal to the two AC, CB, each to each, and the angle DBC is equal to the angle ACB : therefore, the base DC is equal to the base AB, and the triangle DBC (Mr. Southey) is equal to the triangle ACB, the less to the greater, which is absurd,