The first six books of the Elements of Euclid, and propositions i.-xxi. of book xi1885 |
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Αποτελέσματα 1 - 5 από τα 89.
Σελίδα 1
... drawn on a plane is called Plane Geometry ; that which demonstrates the properties of solids , of curved surfaces , and the figures described on curved surfaces , is Geometry Ц B of Three Dimensions . The simplest lines that can be ...
... drawn on a plane is called Plane Geometry ; that which demonstrates the properties of solids , of curved surfaces , and the figures described on curved surfaces , is Geometry Ц B of Three Dimensions . The simplest lines that can be ...
Σελίδα 2
... drawn , the student should construct them from the given directions . The Propositions of Euclid will be printed in larger type , and will be referred to by Roman numerals enclosed in brackets . Thus [ III . xxx11 . ] will denote the ...
... drawn , the student should construct them from the given directions . The Propositions of Euclid will be printed in larger type , and will be referred to by Roman numerals enclosed in brackets . Thus [ III . xxx11 . ] will denote the ...
Σελίδα 5
... drawn between two points . The following illustration is due to Professor Henrici : - " If we suspend a weight by a string , the string becomes stretched , and we say it is straight , by which we mean to express that it has assumed a ...
... drawn between two points . The following illustration is due to Professor Henrici : - " If we suspend a weight by a string , the string becomes stretched , and we say it is straight , by which we mean to express that it has assumed a ...
Σελίδα 6
... drawn from the vertex and turning about it in the plane of the angle , from the position of coincidence with one leg to that of coincidence with the other , is said to turn through the angle , and the angle is the greater as the ...
... drawn from the vertex and turning about it in the plane of the angle , from the position of coincidence with one leg to that of coincidence with the other , is said to turn through the angle , and the angle is the greater as the ...
Σελίδα 9
... drawn from a certain point within the figure to the circumference are A equal to one another . This point is called the centre . XXXIII . A radius of a circle is any right line drawn from the centre to the circum- ference , such as CD ...
... drawn from a certain point within the figure to the circumference are A equal to one another . This point is called the centre . XXXIII . A radius of a circle is any right line drawn from the centre to the circum- ference , such as CD ...
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD AC is equal AD² 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 isosceles 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 295 - Thus the proposition, that the sum of the three angles of a triangle is equal to two right angles, (Euc.
Σελίδα 182 - 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 102 - 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 122 - 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 226 - 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 126 - 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 194 - If there be any number of proportionals, as one antecedent is to its consequent, so is the sum of all the antecedents to the sum of all the consequents.