## Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry and Mensuration. Accompanied with All the Necessary Logarithmic and Trigonometric Tables |

### From inside the book

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**triangle ABC**, we draw two lines to the extremities of one of the sides AB , the angle ADB formed by these lines will be greater than the angle ACB , opposite this side . A D C B For , the sum of the two angles DAB , DBA is obviously ... Page 28

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**triangle ABC**to be placed upon the trian- gle DFG in such a manner that the point C may coincide with the point G , and the side CA with the equal side GD . Then , since the ...**triangles ABC**and DEF , suppose CA 28 GEOMETRY . Of triangles. Page 29

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**triangles ABC**and DEF , suppose CA and CB of the first to be respectively equal to FD and FE of the sec- A L ond , and the included an- C F gle ACB > DFE , then will AB > DE . Apply the triangle DEF upon the trian- gle ABC , making EF ... Page 30

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**triangles ABC**, DFG , if the angle A is equal to the angle D , the angle B equal to the angle F , and the side AB equal to the side DF , then will the triangles be identical , or equal in all respects . C G A B D F For , conceive the ... Page 31

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**triangles**BAD and**ABC**we have the side BDAC by supposi- tion , the side AB common , and the included angle ABD of the first**triangle**equal to BAC , the included angle of the second tri- angle . Hence ( T. XX . ) , the**triangle**BAD is equal ...### Other editions - View all

### Common terms and phrases

a+b+c altitude apothem bisect centre chord circumference circumscribed cone consequently corresponding cosec Cosine Cotang cube cubic cylinder decimal denote diameter dicular divided draw drawn equation equivalent exterior angles feet figure frustum Geom give greater half hence hypotenuse inches intersection logarithm measure multiplied number of sides opposite parallel parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedral angle polyedron prism PROBLEM proportion pyramid quadrant radii radius ratio rectangle regular inscribed regular polygon respectively equal right angles right-angled triangle Scholium secant sector similar similar triangles Sine slant height solid solve the triangle sphere spherical triangle square straight line subtract suppose surface Tang tangent THEOREM three sides triangle ABC triangular prism volume ΙΟ

### Popular passages

Page 35 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.

Page 80 - 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'.

Page 139 - If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines.

Page 17 - The sum of all the angles of a polygon is equal to twice as many right angles as the polygon has sides, less two.

Page 176 - The radius of a sphere is a straight line, drawn from the centre to any point of the...

Page 182 - Every section of a sphere, made by a plane, is a circle.

Page 28 - If two triangles have two sides of the one equal respectively to two sides of the other, but the included angle of the first greater than the included angle of the second, then the third side of the first is greater than the third side of the second. Given A ABC and A'B'C ' with Proof STATEMENTS Apply A A'B'C ' to A ABC so that A'B

Page 165 - ... bases simply : hence two prisms of the same altitude are to each other as their bases. For a like reason, two prisms of the same base are to each other as their altitudes.

Page 29 - ... to two sides of the other, but the third side of the first greater than the third side of the second, the angle opposite the third side of the first is.

Page 13 - 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.