## 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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**right angle**. XIV . An Obtuse angle is one which is greater than a**right angle**. XV . When the sum of two angles is equal to a**right angle**, they are called ...**triangle**. XXIV . A**triangle**having an obtuse angle , is 10 GEOMETRY . Page 11

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**triangle**having an obtuse**angle**, is called an ob- tuse -**angled triangle**. XXV . When the opposite sides of a quadrilateral are parallel , the figure is called a parallelogram . XXVI . When the four**angles**of a parallelo- gram are**right**... Page 17

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**right angles**( T. I. , C. III . ) ; therefore all the exterior angles of the figure are together equal to four right ...**triangle**, the sum of the three angles is equal to two**right angles**. Cor . II . If one angle of a**triangle**is ... Page 28

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**triangles**are identical , and have all their other corresponding parts equal ( A. IX . ) , namely , the side AB equal to the side DF , the angle A equal to the angle D , and the angle B equal to the angle F. Cor . Two**right**-**angled**... Page 31

... triangle have two angles equal , the sides opposite those angles will be equal , and the triangle will be isosceles . In the triangle ABC , if the angles CAB , CBA , are equal ...

... triangle have two angles equal , the sides opposite those angles will be equal , and the triangle will be isosceles . In the triangle ABC , if the angles CAB , CBA , are equal ...

**right**-**angled triangles**are equal FIRST BOOK . 31.### Other editions - View all

### Common terms and phrases

a+b+c ACē altitude angles equal apothem bisect centre chord circ circumference cone consequently corresponding cosec Cosine Cotang cylinder decimal denote described diameter dicular distance divided draw drawn equation equivalent exterior angles feet figure formed frustum give given line greater half hence homologous sides hypotenuse inscribed circle intersection logarithm measure middle point multiplied number of sides opposite 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 sphere spherical triangle square straight line subtract suppose surface Tang tangent THEOREM three sides triangle ABC triangular prism vertex volume