The Essentials of Geometry (plane)D.C. Heath & Company, 1898 - 242 σελίδες |
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Αποτελέσματα 1 - 5 από τα 18.
Σελίδα 7
... acute angle is an angle which is less than a right angle ; as ABC . An obtuse angle is an angle which is greater than a right angle ; as DEF Acute and obtuse angles are called oblique angles ; and intersecting lines . which are not ...
... acute angle is an angle which is less than a right angle ; as ABC . An obtuse angle is an angle which is greater than a right angle ; as DEF Acute and obtuse angles are called oblique angles ; and intersecting lines . which are not ...
Σελίδα 37
... acute or both obtuse ; and supplementary if one is acute and the other obtuse . EXERCISES . 19. If , in the figure of Prop . XXIV . , ZABC = 59 ° , how many degrees are there in each of the angles formed about the point E ? 20. The line ...
... acute or both obtuse ; and supplementary if one is acute and the other obtuse . EXERCISES . 19. If , in the figure of Prop . XXIV . , ZABC = 59 ° , how many degrees are there in each of the angles formed about the point E ? 20. The line ...
Σελίδα 39
... acute angles of a right tri- angle is equal to one right angle . 89. Cor . V. Two right triangles are equal when a leg and an acute angle of one are equal respectively to a leg and the homologous acute angle of the other . The theorem ...
... acute angles of a right tri- angle is equal to one right angle . 89. Cor . V. Two right triangles are equal when a leg and an acute angle of one are equal respectively to a leg and the homologous acute angle of the other . The theorem ...
Σελίδα 71
... acute angle of a right triangle is double the other , the hypotenuse is double the shorter leg . ( Fig . of Ex . 86. Draw CA to middle point of BD . ) 105. If AC be drawn from the vertex of the right angle to the hypotenuse of right ...
... acute angle of a right triangle is double the other , the hypotenuse is double the shorter leg . ( Fig . of Ex . 86. Draw CA to middle point of BD . ) 105. If AC be drawn from the vertex of the right angle to the hypotenuse of right ...
Σελίδα 99
... angle inscribed in a segment greater than a semicircle is acute ; and an angle inscribed in a segment less than a semicircle is obtuse . ( § 193. ) 23. In an inscribed trapezoid the non - parallel sides THE CIRCLE . 99.
... angle inscribed in a segment greater than a semicircle is acute ; and an angle inscribed in a segment less than a semicircle is obtuse . ( § 193. ) 23. In an inscribed trapezoid the non - parallel sides THE CIRCLE . 99.
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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.