## Elements of Geometry: With, Practical Applications |

### From inside the book

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**denotes**90 degrees . That the student may become familiar with some of the numerical denominations of angles frequently used , we have given at one point of view the following : A right - angle , Two right - angles , Three right ... Page 43

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**denote**by the capital let- ters A , B , C , etc. , while their cor- responding interior angles are de- noted by the small letters a , b , c , etc. Now any exterior angle , together with its adjacent interior angle , as A + a , is equal ... Page 44

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**denoted**by n , then the sum of all the interior angles ought to be equal to ( 2 n - 4 ) times a right - angle ; thus , if there are 7 sides in the field , all the angles ought to amount to 10 right - angles , or 9000. If the field ... Page 56

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**denoting**the square of the sum of any number of lines , is as follows : The square of the sum of any number of lines is equal to the square of the first line , plus twice the rectangle of the first line into the sec- ond ; plus the ... Page 61

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**denoted**by AB2 , and therefore AB2 = AC2 + BC2 . ( 51. ) The following is another simple demonstration : Let ABC be the right - angled tri- angle , having the right - angle at C. Upon AC and BC , construct the squares AF and BH ...### Other editions - View all

### Common terms and phrases

a+b+c altitude angle ABC angle BAC angle BCD bisect centre chord circ circular sector circumference circumscribed polygon coincide cone consequently convex surface cylinder denote diagonal diameter dicular distance draw equal and parallel equiangular equilateral triangle equivalent exterior angle figure formed given line greater half the arc hypothenuse inscribed circle intersection isosceles join less Let ABC line AC line CD lines drawn measured by half meet multiplied number of sides parallel planes parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN point G prism PROBLEM produced Prop PROPOSITION pyramid radii radius rectangle regular polygon respectively equal right-angled triangle Sabc Schol Scholium scribed semicircle semicircumference side AC similar similar triangles solid angle sphere spherical triangle square straight line suppose tangent THEOREM three sides triangle ABC triangular prism vertex VIII

### Popular passages

Page 231 - THE sphere is a solid terminated by a curve surface, all the points of which are equally distant from a point within, called the centre.

Page 147 - PROBLEM. To inscribe a circle in a given triangle. Let ABC be the given triangle : it is required to inscribe a circle in the triangle ABC.

Page 17 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.

Page 28 - If two sides and the included angle of the one are respectively equal to two sides and the included angle of the other...

Page 233 - The volume of a cylinder is equal to the product of its base by its altitude. Let the volume of the cylinder be denoted by V, its base by B, and its altitude by H.

Page 276 - THEOREM. Two triangles on the same sphere, or on equal spheres, are equal in all their parts, when they have each an equal angle included between equal sides. Suppose the side...

Page 120 - 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. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.

Page 18 - If equals be added to unequals, the wholes are unequal. V. If equals be taken from unequals, the remainders are unequal. VI. Things which are double of the same, are equal to one another.

Page 232 - A spherical triangle is a portion of the surface of a sphere, bounded by three arcs of great circles.

Page 96 - 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.