An Elementary Treatise on Plane and Solid GeometryJ. Munroe, 1837 - 159 σελίδες |
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Σελίδα xvii
... called an equation . The sign is greater than . Thus , A > B is A greater than B. The sign is less than . Thus , A < B is A less than B. A2 indicates the second power of A , A3 the third pow- er , & c . A ratio or fraction is the ...
... called an equation . The sign is greater than . Thus , A > B is A greater than B. The sign is less than . Thus , A < B is A less than B. A2 indicates the second power of A , A3 the third pow- er , & c . A ratio or fraction is the ...
Σελίδα xviii
... called its extremes ; and the second and third its means . Thus , A and D are the extremes of this proportion , and B and C its means . If the fractions of the preceding proportion are reduced to a common denominator , they give AX D ...
... called its extremes ; and the second and third its means . Thus , A and D are the extremes of this proportion , and B and C its means . If the fractions of the preceding proportion are reduced to a common denominator , they give AX D ...
Σελίδα xix
... called the mean proportional between the extremes . Thus , if A : B B : D , www B is a mean proportional between A and D , and we have , by the test , B2 = AXD ; or , BAX D ; that is , the mean proportional between two quantities is the ...
... called the mean proportional between the extremes . Thus , if A : B B : D , www B is a mean proportional between A and D , and we have , by the test , B2 = AXD ; or , BAX D ; that is , the mean proportional between two quantities is the ...
Σελίδα 1
... called a demonstration . A Problem is a question proposed which requires a solution . A Lemma is a subsidiary truth employed in the demonstration of a theorem , or in the solution of a problem . A Corollary is a consequence which ...
... called a demonstration . A Problem is a question proposed which requires a solution . A Lemma is a subsidiary truth employed in the demonstration of a theorem , or in the solution of a problem . A Corollary is a consequence which ...
Σελίδα 7
... called a Right angle , and the lines are said to be perpendicular to each other . 21. Definitions . An Acute angle is one less than a right angle , as A ( fig . 4 ) . An Obtuse angle is one greater than a right angle , as A ( fig . 6 ) ...
... called a Right angle , and the lines are said to be perpendicular to each other . 21. Definitions . An Acute angle is one less than a right angle , as A ( fig . 4 ) . An Obtuse angle is one greater than a right angle , as A ( fig . 6 ) ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD &c AC AC adjacent angles altitude angle ABC angle BAC arc BC base and altitude bisect CD fig centre chord circumference convex surface Corollary cylinder DEF fig Definitions Demonstration denote diameter divided Draw equal arcs equal distances equilateral equivalent four right angles frustum given angle given circle given line given polygon given sides given square greater half the product Hence homologous sides hypothenuse infinitely small inscribed circle isoperimetrical isosceles Join AC Let ABCD line AB fig lines drawn mean proportional number of sides oblique lines parallel lines parallelogram parallelopiped perimeter perpendicular plane angles plane MN polygon ABCD prism Problem radii radius ratio rectangles regular polygon respectively equal right triangles Scholium secant sector segment side AC similar polygons similar triangles solid angle Solution sphere spherical polygon spherical triangle tangent Theorem triangles ABC triangular prism vertex vertices whence
Δημοφιλή αποσπάσματα
Σελίδα 148 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Σελίδα 90 - To construct a parallelogram equivalent to a given square, and having the difference of its base and altitude equal to a given line.
Σελίδα 24 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Σελίδα 40 - One side and two angles of a triangle being given, to construct the triangle. Solution.
Σελίδα 79 - Construct, by § 145, a right triangle, of which the hypothenuse BC (fig. 79) is equal to the side of the greater square, and the leg AB is equal to the side of the less square ; and AC is the side of the required square.
Σελίδα 142 - THEOREM. If two triangles on the same sphere, or on equal spheres, are mutually equiangular, they will also be mutually equilateral. Let A and B be the two given triangles; P and Q their polar triangles. Since the angles are equal in the triangles A and B, the sides will be equal in. their polar triangles P and Q (Prop.
Σελίδα 6 - The preface and commentary to the Antigone are even more creditable to Mr. Woolsey's ability than those to the Alcestis. The sketch of the poem, in the preface, is written with clearness and brevity. The difficulties in this play, that call for a commentator's explanation, are far more numerous than in the Alcestis.
Σελίδα 70 - 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 5 - A surface is that which has length and breadth, without thickness. 6. A plane is a surface, in which any two points being taken, the straight line joining those points lies wholly in that surface.
Σελίδα 137 - Each side of a spherical triangle is less than the sum of 'the other two sides. 48. The sum of the sides of a spherical polygon is less than 360°.