The first six books of the Elements of Euclid, and propositions i.-xxi. of book xi1885 |
Inni boken
Resultat 1-5 av 41
Side 21
... point A to the intersection of the lines CF and BG is an axis of symmetry of the figure . 3. If two isoscles ... points be taken on the sides of an equilateral tri- angle , namely , one on each side , at equal distances from the angles ...
... point A to the intersection of the lines CF and BG is an axis of symmetry of the figure . 3. If two isoscles ... points be taken on the sides of an equilateral tri- angle , namely , one on each side , at equal distances from the angles ...
Side 23
... intersect each other only in one point on the same side of the line joining their centres , and hence that two circles cannot have more than two points of intersection . PROP . VIII . - THEOREM . If two triangles ( ABC , DEF ) have two ...
... intersect each other only in one point on the same side of the line joining their centres , and hence that two circles cannot have more than two points of intersection . PROP . VIII . - THEOREM . If two triangles ( ABC , DEF ) have two ...
Side 36
... lines which can be drawn to its angular points from any point except the intersection of the diagonals . PROP . XXI . - THEOREM . If two lines ( BD , CD ) be drawn to a point ( D ) within a triangle from the extremities of its base ( BC ) ...
... lines which can be drawn to its angular points from any point except the intersection of the diagonals . PROP . XXI . - THEOREM . If two lines ( BD , CD ) be drawn to a point ( D ) within a triangle from the extremities of its base ( BC ) ...
Side 45
... points of intersection is called its third diagonal . DEF . v . - A quadrilateral which has one pair of op- posite sides parallel is called a trapezium . DEF . VI . - If from the extremities of one right line perpendiculars be drawn to ...
... points of intersection is called its third diagonal . DEF . v . - A quadrilateral which has one pair of op- posite sides parallel is called a trapezium . DEF . VI . - If from the extremities of one right line perpendiculars be drawn to ...
Side 57
... lines drawn from the vertex to the points of division will divide the whole triangle into as many equal parts . 4 ... intersection of BOOK 1. ] THE ELEMENTS OF EUCLID . 57.
... lines drawn from the vertex to the points of division will divide the whole triangle into as many equal parts . 4 ... intersection of BOOK 1. ] THE ELEMENTS OF EUCLID . 57.
Vanlige uttrykk og setninger
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
Populære avsnitt
Side 295 - Thus the proposition, that the sum of the three angles of a triangle is equal to two right angles, (Euc.
Side 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...
Side 9 - LET it be granted that a straight line may be drawn from any one point to any other point.
Side 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.
Side 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...
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.