Elements of Plane Geometry: For the Use of SchoolsLewis & Sampson, 1844 - 96 σελίδες |
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Αποτελέσματα 1 - 5 από τα 28.
Σελίδα 11
... perpendicular to AB ; the angles ACE , ECB , will be right angles ( Def . 6 ) , and their sum , consequently , two right angles ; but the opening between the lines AC and CD , which is the angle ACD , added to the opening between the ...
... perpendicular to AB ; the angles ACE , ECB , will be right angles ( Def . 6 ) , and their sum , consequently , two right angles ; but the opening between the lines AC and CD , which is the angle ACD , added to the opening between the ...
Σελίδα 17
... perpendicular to one of two parallels will be perpendicu- lar to the other . Let EF be drawn perpendicular to △ - AB ; now , because it cuts the two parallels , it makes the alternate angles AIF , Fig . 10 . E I B -D EOD , equal , and ...
... perpendicular to one of two parallels will be perpendicu- lar to the other . Let EF be drawn perpendicular to △ - AB ; now , because it cuts the two parallels , it makes the alternate angles AIF , Fig . 10 . E I B -D EOD , equal , and ...
Σελίδα 18
... perpendicular to a third line are parallel to each other ; because the alternate angles AIF , EOD , 0 E I B D F being right angles , are equal to each other . Cor . 3. Hence , if to each of two parallels , perpendic- ulars be drawn ...
... perpendicular to a third line are parallel to each other ; because the alternate angles AIF , EOD , 0 E I B D F being right angles , are equal to each other . Cor . 3. Hence , if to each of two parallels , perpendic- ulars be drawn ...
Σελίδα 19
... perpendicular to AB , it will also ( by Prop . 9 , Cor . 2 ) be perpendicular to both CD and EF ; hence these lines , being both perpendicular to the same line , are parallel to each other ( Prop . 10 , Cor . 2 ) . PROP . XII . THEOREM ...
... perpendicular to AB , it will also ( by Prop . 9 , Cor . 2 ) be perpendicular to both CD and EF ; hence these lines , being both perpendicular to the same line , are parallel to each other ( Prop . 10 , Cor . 2 ) . PROP . XII . THEOREM ...
Σελίδα 23
... perpendicular is the shortest distance from a point to a straight line . Let A be the point , BC the straight line ; we have to prove that the perpendicular AD is shorter than any other line which can be drawn from A to BC . Fig . 19 ...
... perpendicular is the shortest distance from a point to a straight line . Let A be the point , BC the straight line ; we have to prove that the perpendicular AD is shorter than any other line which can be drawn from A to BC . Fig . 19 ...
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.