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 páginas |
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Página 8
... sides . XXI . A triangle whose three sides are unequal is said to be scalene , as A ; a triangle having two sides equal , to be isosceles , as B ; and and having all its sides equal , to be equilateral , as C. A B XXII . A right ...
... sides . XXI . A triangle whose three sides are unequal is said to be scalene , as A ; a triangle having two sides equal , to be isosceles , as B ; and and having all its sides equal , to be equilateral , as C. A B XXII . A right ...
Página 9
... sides is called a quadri- lateral . XXIX . A quadrilateral whose four sides are equal is called a lozenge . Xxx . A lozenge which has a right angle is called a square . XXXI . A polygon which has five sides is called a pentagon ; one ...
... sides is called a quadri- lateral . XXIX . A quadrilateral whose four sides are equal is called a lozenge . Xxx . A lozenge which has a right angle is called a square . XXXI . A polygon which has five sides is called a pentagon ; one ...
Página 17
... sides ( BA , AC ) of one equal respectively to two sides ( ED , DF ) of the other , and have also the angles ( A , D ) included by those sides equal , the triangles shall be equal in every respect- that is , their bases or third sides ...
... sides ( BA , AC ) of one equal respectively to two sides ( ED , DF ) of the other , and have also the angles ( A , D ) included by those sides equal , the triangles shall be equal in every respect- that is , their bases or third sides ...
Página 19
... sides of a quadrilateral be equal , and the diagonal bisects the angle between them , their other sides are equal . 3. If two lines be at right angles , and if each bisect the other , then any point in either is equally distant from the ...
... sides of a quadrilateral be equal , and the diagonal bisects the angle between them , their other sides are equal . 3. If two lines be at right angles , and if each bisect the other , then any point in either is equally distant from the ...
Página 20
... sides BF , FC in one equal to the two sides CG , GB in the other ; and the angle BFC contained by the two sides of one equal to the angle CGB contained by the two sides of the other . Therefore [ IV . ] these triangles have the angle ...
... sides BF , FC in one equal to the two sides CG , GB in the other ; and the angle BFC contained by the two sides of one equal to the angle CGB contained by the two sides of the other . Therefore [ IV . ] these triangles have the angle ...
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Términos y frases comunes
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
Pasajes populares
Página 299 - Thus the proposition, that the sum of the three angles of a triangle is equal to two right angles, (Euc.
Página 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...
Página 9 - LET it be granted that a straight line may be drawn from any one point to any other point.
Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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.
Página 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,