## Elements of Geometry and Trigonometry |

### From inside the book

Page 109

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**regular**polygon .**Regular**polygons may have any number of sides : the equilateral triangle is one of three sides ; the square is one of four . PROPOSITION I. THEOREM . Two**regular**polygons of the same number of sides are similar figures ...Page 113

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**regular**decagon , and will require to be applied ten times to the circumference . For , drawing MB , we have by ...**regular**decagon . 2d . By joining the alternate corners of the**regular**decagon , the pentagon ACEGI will be formed , also ...Page 205

Adrien Marie Legendre Charles Davies. APPENDIX . THE

Adrien Marie Legendre Charles Davies. APPENDIX . THE

**REGULAR**POLYEDRONS . A**regular**polyedron is one whose faces are all equal**regular**polygons , and whose solid angles are all equal to each other . There are five such polyedrons . First ...### Contents

Ratios and Proportions | 34 |

The Circle and the Measurement of Angles | 41 |

Problems relating to the First and Third Books | 57 |

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### 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 consequently convex surface Cosine Cotang 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 M.
M. Sine number of sides opposite parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedron polygon ABCDE PROBLEM Prop proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle S-ABC Scholium secant segment similar slant height solid angle solid described sphere spherical polygon spherical triangle square described straight line Tang tangent THEOREM triangle ABC triangular prism vertex