The Essentials of Geometry (plane)D.C. Heath & Company, 1898 - 242 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 30.
Σελίδα 6
... meeting the given line in such a way as to make the adjacent angles equal , each of the equal angles is called a right angle , and the lines are said to be perpendicular ( 1 ) to each other . Thus , if from point A in straight line CD ...
... meeting the given line in such a way as to make the adjacent angles equal , each of the equal angles is called a right angle , and the lines are said to be perpendicular ( 1 ) to each other . Thus , if from point A in straight line CD ...
Σελίδα 40
... meeting BC at H ; also , draw line GH . In A AGH and ACH , AH = AH . AG - AC . ZGAH = / CAH . Also , by hyp . , And by cons . , .. Δ AGH = Δ ACH . [ Two are equal when two sides and the included of one are equal respectively to two ...
... meeting BC at H ; also , draw line GH . In A AGH and ACH , AH = AH . AG - AC . ZGAH = / CAH . Also , by hyp . , And by cons . , .. Δ AGH = Δ ACH . [ Two are equal when two sides and the included of one are equal respectively to two ...
Σελίδα 58
... line DE joining middle points of sides AB and AC , respectively , of A ABC . To Prove DE || BC , and DE = BC . Proof . Draw line BF AC , meeting ED produced at F. In A ADE and BDF , LADE = / BDF 58 PLANE GEOMETRY . - BOOK I.
... line DE joining middle points of sides AB and AC , respectively , of A ABC . To Prove DE || BC , and DE = BC . Proof . Draw line BF AC , meeting ED produced at F. In A ADE and BDF , LADE = / BDF 58 PLANE GEOMETRY . - BOOK I.
Σελίδα 60
... meeting CD at K ; and draw line BD in- tersecting EF at G , and EK at H. In △ ABD , EH is || AD and bisects AB ; then it bisects BD . [ The line which bisects one side of a △ , and is || to another side , bisects also the third side ...
... meeting CD at K ; and draw line BD in- tersecting EF at G , and EK at H. In △ ABD , EH is || AD and bisects AB ; then it bisects BD . [ The line which bisects one side of a △ , and is || to another side , bisects also the third side ...
Σελίδα 68
... meeting CA produced at E , prove triangle ADE isosceles . 74. From C , one of the extremities of the base BC of isosceles triangle ABC , a line is drawn meet- ing BA produced at D , making AD AB . Prove CD perpendicular to BC . ( § 84 ...
... meeting CA produced at E , prove triangle ADE isosceles . 74. From C , one of the extremities of the base BC of isosceles triangle ABC , a line is drawn meet- ing BA produced at D , making AD AB . Prove CD perpendicular to BC . ( § 84 ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
AB² AC and BC AC² adjacent angles altitude angles are equal apothem approach the limit arc BC base and altitude BC² bisector bisects CD² centre chord circumference circumscribed construct the triangle Converse of Prop decagon diagonals diameter Draw line EFGH equal angles equal respectively equally distant equiangular polygon equilateral triangle equivalent exterior angle figure Given line given point given square homologous sides hypotenuse isosceles triangle line CD line joining measured by arc middle point non-parallel sides number of sides opposite sides parallel parallelogram perimeter perpendicular points of sides polygons AC produced Prove Proof quadrilateral radii radius ratio rectangle regular inscribed regular polygon rhombus right angles right triangle secant segment side BC similar triangles subtended tangent THEOREM transversal trapezoid triangle is equal vertex ZAOB
Δημοφιλή αποσπάσματα
Σελίδα 73 - A chord is a straight line joining the extremities of an arc ; as AB.
Σελίδα 124 - In any proportion the terms are in proportion by Composition ; that is, the sum of the first two terms is to the first term as the sum of the last two terms is to the third term.
Σελίδα 122 - To express that the ratio of A to B is equal to the ratio of C to D, we write the quantities thus : A : B : : C : D ; and read, A is to B as C to D.
Σελίδα 151 - If one leg of a right triangle is double the other, the perpendicular from the vertex of the right angle to the hypotenuse divides it into segments which are to each other as 1 to 4.
Σελίδα 224 - The perpendiculars from the vertices of a triangle to the opposite sides are the bisectors of the angles of the triangle formed by joining the feet of the perpendiculars.
Σελίδα 40 - If two triangles have two sides of one equal respectively to two sides of the other, but the included angle of the first greater than the included angle of the second, then the third side of the first is greater than the third side of the second.
Σελίδα 38 - An exterior angle of a triangle is equal to the sum of the two opposite interior angles.
Σελίδα 192 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their areas are to each other as the squares of those sides (Prop.
Σελίδα 193 - The areas of two regular polygons of the same number of sides are to each other as the squares of their radii or as the squares of their apothems.
Σελίδα 142 - In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.