## A Text-book of Geometry |

### From inside the book

Results 1-5 of 26

Page 4

George Albert Wentworth. A straight

George Albert Wentworth. A straight

**line**, or right**line**, is a**line**same direction throughout its A. whole extent ...**joining**th will lie wholly in the surface . 22. A curved surface is a surface no part of which 23. Figure or form depends ... Page 5

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**line**; posi- and Sare n the rec- called urved STRAIGHT**LINES**. 29. Through a point an indefinite number of straight ...**joining**two points the shortest is the straight**line**, and the length of the straight**line**is called the distance 11 ... Page 22

... lines are said to lie in the same di they are on the same side of the straight line joini gins , and in opposite directions when they are on of the straight

... lines are said to lie in the same di they are on the same side of the straight line joini gins , and in opposite directions when they are on of the straight

**line joining**their origins . PROPOSITION VI . 100. Two straight lines in the ... Page 57

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**line joining**two opposite vertices . PROPOSITION XXXVII . THEOREM . 178. The diagonal of a parallelogram divides the ... lines ) . . : . Δ ΑΒ ( = Δ AEC , $ 147 ( having a side and two adj . 4 of the one equal respectively to a side and ... Page 64

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**line**to BC . Then this**line**is to DE , by § 111. The three parallels by hypothesis intercept equal parts on the ...**joining**D and E with this parallel and is to BC . Also , since ER to AB bisects AC , it bisects BC , by § 188 ; that is , = BC ...### Other editions - View all

### Common terms and phrases

ABē ABCD ACē acute angle adjacent angles altitude angle formed angles are equal base bisector bisects called centre chord circumference circumscribed coincide construct a square decagon diagonals diameter Draw equal respectively equiangular equiangular polygon equidistant equilateral polygon equilateral triangle exterior angle feet figure Find the area given circle given line given point given straight line given triangle greater Hence homologous sides hypotenuse inches intersecting isosceles triangle legs length line drawn line joining measured by arc middle points number of sides obtuse opposite sides parallel parallelogram perimeter perpendicular PROPOSITION prove Proof quadrilateral radii ratio rectangle regular inscribed regular polygon rhombus right angle right triangle SCHOLIUM secant segments similar polygons square equivalent straight angle subtended tangent THEOREM third side trapezoid triangle ABC triangle is equal vertex vertices

### Popular passages

Page 46 - 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, the third side of the first is greater than the third side of the second...

Page 69 - The exterior angles of a polygon, made by producing each of its sides in succession, are together equal to four right angles.

Page 187 - Two triangles having 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.

Page 64 - The straight line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of it 46 INTERCEPTS BY PARALLEL LINES.

Page 201 - To construct a parallelogram equivalent to a given square, and having the sum of its base and altitude equal to a given line.

Page 215 - 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.

Page 161 - In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other upon that side.

Page 135 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.

Page 156 - If in a right triangle a perpendicular is drawn from the vertex of the right angle to the hypotenuse : I.

Page 15 - LET it be granted that a straight line may be drawn from any one point to any other point. 2. That a terminated straight line may be produced to any length in a straight line. 3.