## Elements of Geometry and Trigonometry |

### From inside the book

Results 1-5 of 53

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**vertex**A ; sometimes by the three letters BAC , or CAB , the letter at the**vertex**being always placed in the middle . Angles , like all other quantities , are susceptible of addition , subtraction , multiplication , and division . Thus ... Page 12

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**vertex**of the angle . The sign The sign is called minus : it indicates subtraction . Thus , A + B , represents the sum of the quantities A and B ; A - B represents their difference , or what remains after B is taken from A ; and A - B + ... Page 20

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**vertex**of an isosceles triangle to the middle point of its base , is perpendicular to the base , and divides the angle at the**vertex**into two equal parts . In a triangle which is not isosceles , any side may be assumed indifferently as ... Page 30

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**vertex**of any one angle A , diagonals B AC , AD , AE , AF , be drawn to the**vertices**of all the opposite angles , it is plain that the poly- gon will be divided into five triangles , if it has seven sides ; into six triangles , if it ... Page 41

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**vertex**in the circumference , and is formed by two chords . B * Note . In common language , the circle is sometimes confounded with its circumference : but the correct expression may always be easily recurred to if we bear in mind that ...### Other editions - View all

### Common terms and phrases

adjacent adjacent angles altitude angle ACB angle BAC ar.-comp base multiplied bisect Book centre chord circ circumference circumscribed common cone convex surface Cosine Cotang cylinder diagonal diameter dicular distance draw drawn equal angles equally distant equiangular equivalent figure formed four right angles frustum given angle given line gles greater homologous sides hypothenuse inscribed polygon intersection less Let ABC let fall logarithm measured by half number of sides oblique lines opposite parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedron polygon ABCDE prism proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle S-ABC Scholium secant secant line segment side BC similar sine solid angle solid described sphere spherical polygon spherical triangle square described straight line tang tangent THEOREM triangle ABC triangular prism vertex