## Plane geometry |

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### Contents

An Introduction to Geometry | 9 |

A Study of Angles | 24 |

A Study of Triangles | 57 |

Copyright | |

14 other sections not shown

### Common terms and phrases

AABC acute angle adjacent angles algebra angle formed angles are equal arc degrees bisects central angle chapter chord circumscribed circle congruent triangles Construct corresponding angles corresponding sides diagonals diameter distance divided drawn end points equal arcs equal sides equally distant equation equilateral triangle Exercises feet Figure Find the area Find the length Find the ratio formula geometry given line given point given triangle Hence hypotenuse inches inscribed angle interior angles isosceles triangle line segment locus measure median method mid-points number of degrees number of sides opposite sides parallel lines parallelogram perimeter perpendicular bisector plane postulate Proof Proposition protractor Prove quadrilateral radii radius rectangle regular polygon rhombus right angle right triangle secant Show side opposite similar triangles square statement straight angle straight line supplementary angles tangent Theorem trapezoid triangle ABC triangle are equal unequal vertex vertices