## Elementary Geometry |

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### Contents

Straight lines | 5 |

Regular polygons | 17 |

Pyramidsthe Tetrahedron | 27 |

Parallels and perpendiculars | 35 |

Cube cuboid prism wedge | 42 |

Heights and distances | 48 |

Points lines surfaces solids | 55 |

THEORETICAL GEOMETRY | 63 |

Miscellaneous exercises | 115 |

If two angles of a triangle are unequal | 122 |

Of all the straight lines that can be drawn | 130 |

1 A quadrilateral is a parallelogram | 136 |

Subdivision of a straight line | 140 |

Coordinates | 152 |

page | 159 |

Area of parallelogram | 167 |

If two straight lines intersect the vertically | 69 |

A theorem and its converse | 76 |

Angles of a triangle a polygon | 80 |

If two angles of a triangle are equal | 96 |

Constructions | 103 |

Area of polygon | 178 |

Miscellaneous exercises on area | 186 |

Illustrations or algebraical identities by means | 201 |

Projections | 210 |

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### Common terms and phrases

acute angle altitude angle of elevation angles are equal angles equal base BC bisect centimetres centre Constr Construct a triangle corresponding angles Data ABC divided Draw a straight equal sides equidistant equilateral triangle equivalent triangle exterior angles find a point Find the area Find the distance Freehand Geometry Give a proof given angle given straight line height hypotenuse inch paper intersect isosceles trapezium isosceles triangle ITEx locus median miles obtuse obtuse-angled opposite sides pair parallelogram parallelogram ABCD pentagon polygon produced protractor prove Pythagoras quadrilateral ABCD radius rect rectangle rectangle contained regular polygons Repeat Ex rhombus right angles right-angled triangle set square sides equal square inch straight edge straight line joining Theorem trapezium triangle ABC triangles are congruent units of length vertex vertices yards

### Popular passages

Page xiv - If there are three or more parallel straight lines, and the intercepts made by them on any straight line that cuts them are equal, then the corresponding intercepts on any other straight line that cuts them are also equal.