## First Lessons in Geometry: With Practical Applications in Mensuration, and Artificers' Work and Mechanics |

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12 feet 20 feet ABCD acres altitude attraction base body bounded breadth brick called centre chord circle circumference cone contain convex surface cubic feet cubic inches curve cylinder decimal describe diameter dimensions distance divided divisions draw drawn entire equal EXAMPLES Explain the manner face fall feet 6 inches figure find the area find the solidity foot frustum Geometry girt give given given line given point greater half Hence hexagon inches inscribed intersect kind known length less lever marked mean measure Mechanical Mensuration of Surfaces motion move Multiply opposite parallel pass perpendicular piece plane polygon Practical prism PROBLEM pulley pyramid radius rectangle regular right angles ring rods Round Bodies RULE scale segment side similar solidity specific gravity sphere square feet straight line thickness timber triangle unit weight

### Popular passages

Page 35 - If two triangles have two angles and the included side of the one, equal to two angles and the included side of the other, each to each, the two triangles will be equal.

Page 20 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.

Page 32 - The area of a rectangle is equal to the product of its base and altitude. Given R a rectangle with base b and altitude a. To prove R = a X b. Proof. Let U be the unit of surface. .R axb U' Then 1x1 But - is the area of R.

Page 82 - A zone is a portion of the surface of a sphere, included between two parallel planes which form its bases.

Page 142 - From eight times the chord of half the arc, subtract the chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearly.

Page 84 - The convex surface of a cylinder is equal to the circumference of its base multiplied by its altitude.

Page 35 - If two triangles have two sides and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal in all their parts." Axiom 1. "Things which are equal to the same thing, are equal to each other.

Page 41 - Similar figures, are those that have all the angles of the one equal to all the angles of the other, each to each, and the sides about the equal angles proportional.

Page 36 - The angles opposite the equal sides of an isosceles triangle are equal.

Page 20 - For this purpose it is divided into 360 equal parts, called degrees, each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds. The degrees, minutes, and seconds, are marked thus, °, ', " ; and 9° 18' 10", are read, 9 degrees, 18 minutes, and 10 seconds.