## Elements of Geometry and Trigonometry |

### From inside the book

Results 1-5 of 54

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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 ... Page 12

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**vertex**of the angle . The sign is called plus : it indicates addition . 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 ... 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 VII centre chord circ circumference circumscribed common cone convex surface Cosine cylinder diagonal diameter dicular distance divided draw drawn equally distant equations equivalent feet figure find the area formed four right angles frustum given angle given line gles greater homologous sides hypothenuse inscribed circle inscribed polygon intersection less Let ABC logarithm number of sides opposite parallelogram parallelopipedon pendicular perimeter perpen perpendicular perpendicular let fall plane MN polyedron polygon ABCDE PROBLEM proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle S-ABCDE Scholium secant segment similar Sine Cotang slant height solid angle solid described sphere spherical polygon spherical triangle square described straight line tang tangent THEOREM triangle ABC triangular prism vertex