## Plane Geometry: And Supplements |

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Page 120

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**opposite sides**are parallel . ( Read §36 B again . ) This is sufficient as definition even though we shall prove and ...**opposite side**is the altitude to that base , as EF . 122. ( a ) A diagonal of a parallelogram separates it ...Page 122

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**opposite sides**of a quadrilateral are equal , the quadrilateral is a parallelogram . Use the figure for §128 above ...**opposite sides**are parallel . ( b ) Prove one pair of sides equal and parallel . ( c ) Prove its**opposite sides**...Page 126

... sides of a square are equal and all the angles are right angles . D C A 1. ( a ) Prove that the

... sides of a square are equal and all the angles are right angles . D C A 1. ( a ) Prove that the

**opposite sides**of a square are equal . ( b ) Prove that all the sides of a square are equal . 2. Why are all the angles of a square right ...### Contents

g The optional units from analytic geometry are included for three | 1 |

LinesAnglesPlanes | 11 |

W W | 24 |

Copyright | |

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### Common terms and phrases

ABCD acute angle adjoining figure altitude angle formed angles are equal apothem bisector bisects central angle chord conclusion congruent Construct converse coplanar corresponding sides diagonals diameter dihedral Draw drawn equal circles equidistant equilateral triangle exercises extended exterior angle figure for Ex Find frustum geometry given hypotenuse Hypothesis Informal proof inscribed intersect isosceles trapezoid isosceles triangle kind of angle lateral area length locus of points mean proportional measure meeting mid-point opposite sides parallel parallelogram perimeter perpendicular perpendicular-bisector Plan plane plane geometry Post postulate prism Prove pyramid quadrilateral radii radius ratio rectangle regular polygon rhombus right angle right circular right triangle secant segment similar sphere square Statements straight line Suggestion tangent theorem trapezoid trihedral angle vertex vertical angles Нур