First Lessons in Geometry: With Practical Applications in Mensuration, and Artificers' Work and Mechanics |
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Page 19
... to each other ? Make two right angles . Point out the equal angles . 4. What is an acute angle ? Make one . 5. What is an obtuse angle ? Make one . Measure . - Of Angles . 6. The circumference of PART I. - SECTION II . 19.
... to each other ? Make two right angles . Point out the equal angles . 4. What is an acute angle ? Make one . 5. What is an obtuse angle ? Make one . Measure . - Of Angles . 6. The circumference of PART I. - SECTION II . 19.
Page 20
... circumference of a circle . E ċ B 7. The circumference of a circle is used for the mea- surement of angles . For this purpose it is divided into 360 equal parts , called degrees , each degree is divided into 60 equal parts called ...
... circumference of a circle . E ċ B 7. The circumference of a circle is used for the mea- surement of angles . For this purpose it is divided into 360 equal parts , called degrees , each degree is divided into 60 equal parts called ...
Page 21
... circumference of the circle into the four equal parts BD , DA , D B AE , and EB , and each part will measure one of ... circumference is called a quadrant , and contains 90 degrees . One half of the circumfe- rence is called a semi ...
... circumference of the circle into the four equal parts BD , DA , D B AE , and EB , and each part will measure one of ... circumference is called a quadrant , and contains 90 degrees . One half of the circumfe- rence is called a semi ...
Page 22
... circumference . And if there be several angles CBF , FBE , EBD , DBA , formed on the F same side of a line , their sum for a c E D like reason , will be equal to two right angles . 12. The sum of all the angles ACB , BCD , DCA , which ...
... circumference . And if there be several angles CBF , FBE , EBD , DBA , formed on the F same side of a line , their sum for a c E D like reason , will be equal to two right angles . 12. The sum of all the angles ACB , BCD , DCA , which ...
Page 47
... circumference . Thus , the space B č enclosed by the curve ABD is called a circle : the curve ABD is the circumference , and the point C the centre . QUEST . - 17 . What is the sum of the squares of the diagonals of a par- allelogram ...
... circumference . Thus , the space B č enclosed by the curve ABD is called a circle : the curve ABD is the circumference , and the point C the centre . QUEST . - 17 . What is the sum of the squares of the diagonals of a par- allelogram ...
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Common terms and phrases
12 feet 20 feet acres altitude bisect bounded by Planes breadth called centre of gravity chord circular sector circumfer circumference cone convex surface cubic feet cubic foot cubic inches cylinder decimal diagonals diameter distance divide draw equilateral triangle EXAMPLES Explain the manner feet 6 inches figure find the area find the solidity frustum given angle given line given point gles half hypothenuse intersect line be drawn linear unit lower base manner of inscribing Mensuration of Surfaces multiplied number of square parallel planes parallelogram parallelopipedon pentagon pentagonal pyramid perpendicular Practical Geometry.-Problems PROBLEM pulley pyramid radius rectangle regular polygon regular solids Required the area rhombus right angled triangle Round Bodies RULE scale of equal secant line segment similar polygons similar triangles slant height solid content solid feet Solids bounded specific gravity sphere square feet square yards straight line tangent thickness upper base weight
Popular passages
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 40 - Similar triangles are to each other as the squares described on their homologous sides. Let ABC, DEF be two similar triangles...
Page 82 - A zone is a portion of the surface of a sphere included between two parallel planes.
Page 235 - An equilibrium is produced in all the levers, when the weight multiplied by its distance from the fulcrum is equal to the product of the power multiplied by its distance from the fulcrum. That...
Page 84 - The convex surface of a cylinder is equal to the circumference of its base multiplied by its altitude.
Page 34 - The area of a triangle is equal to half the product of the base and height.
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 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.
Page 83 - The surface of a sphere is equal to the product of its diameter by the circumference of a great circle.