Elements of Plane Geometry: For the Use of SchoolsLewis & Sampson, 1844 - 96 σελίδες |
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Σελίδα 5
... hence , 3. A point has neither length , breadth , nor thickness , but position only . 4. A straight line is one , the direction of which is always the same . 5. When two straight lines meet , the opening between them is called an angle ...
... hence , 3. A point has neither length , breadth , nor thickness , but position only . 4. A straight line is one , the direction of which is always the same . 5. When two straight lines meet , the opening between them is called an angle ...
Σελίδα 11
... hence ACD + DCB must be equal to two right angles . Fig . 2 . Corollary 1 . The sum of all the angles , H formed by any number of straight lines , drawn on the same side of another straight line , from any point in it , is A equal to ...
... hence ACD + DCB must be equal to two right angles . Fig . 2 . Corollary 1 . The sum of all the angles , H formed by any number of straight lines , drawn on the same side of another straight line , from any point in it , is A equal to ...
Σελίδα 12
For the Use of Schools Nicholas Tillinghast. to two right angles ; hence the sum of all the angles must also be equal to two right angles . Cor . 2. The sum of all the angles formed on both sides the line A B , by lines meeting at C , is ...
For the Use of Schools Nicholas Tillinghast. to two right angles ; hence the sum of all the angles must also be equal to two right angles . Cor . 2. The sum of all the angles formed on both sides the line A B , by lines meeting at C , is ...
Σελίδα 14
... FDE is equal to the angle CAB , DF will take the direction AC ; and , since the angle DEF is equal to the angle ABC , EF will take the direction BC ; hence DF , EF , will intersect at C , and 14 [ BOOK I. EQUALITY OF TRIANGLES .
... FDE is equal to the angle CAB , DF will take the direction AC ; and , since the angle DEF is equal to the angle ABC , EF will take the direction BC ; hence DF , EF , will intersect at C , and 14 [ BOOK I. EQUALITY OF TRIANGLES .
Σελίδα 15
... hence the two triangles are equal ( Prop . 4 ) , and the angle A is equal to the angle C. Cor . 1. From the equality of the two triangles ABD , CBD , we see further that AD is equal to DC , and the angles BDA , BDC , are equal , and hence ...
... hence the two triangles are equal ( Prop . 4 ) , and the angle A is equal to the angle C. Cor . 1. From the equality of the two triangles ABD , CBD , we see further that AD is equal to DC , and the angles BDA , BDC , are equal , and hence ...
Άλλες εκδόσεις - Προβολή όλων
Elements of Plane Geometry: For the Use of Schools - Primary Source Edition Nicholas Tillinghast Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2013 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD adjacent angles allel alternate angles altitude angle ABC angles ABD angles is equal antecedent and consequent B. I. Ax base centre circle whose radius circumference circumscribed circumscribed circle Converse of Prop describe an arc diagonal diameter divide draw the line equal angles equal B. I. Prop equal chords equal Prop equal respectively equiangular equivalent feet given angle given line given point given side half hence the triangles hypotenuse included angle inscribed angle Let the triangles line drawn linear units longer than AC multiplied number of sides oblique lines parallel to CD parallelogram perimeter perpendicular PROBLEM prove radii rectangle regular polygons respectively equal right angles Prop right-angled triangle Scholium sides AC similar subtended tangent THEOREM three sides triangles ABC triangles are equal vertex
Δημοφιλή αποσπάσματα
Σελίδα 31 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Σελίδα 63 - The square described on the hypothenuse of a right-angled triangle is equivalent to the sum of the squares described on the other two sides.
Σελίδα 70 - 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. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Σελίδα 53 - In any proportion, the product of the means is equal to the product of the extremes.
Σελίδα 87 - 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 54 - In a series of equal ratios, any antecedent is to its consequent, as the sum of all the antecedents is to the sum of all the consequents. Let a: 6 = c: d = e :/. Then, by Art.
Σελίδα 81 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 59 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Σελίδα 61 - From this proposition it is evident, that the square described on the difference of two lines is equivalent to the sum of the squares described on the lines respectively, minus twice the rectangle contained by the lines.
Σελίδα 82 - The side of a regular hexagon inscribed in a circle is equal to the radius of the circle.