## Plane Geometry: And Supplements |

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**quadrilateral**are equal , the**quadrilateral**is a parallelogram . Use the figure for §128 above . Hyp . In A DCB , AB = DC , BC = AD . Con . ADCB is a 囗. Analysis . A DCB is a ☐ if AB || DC and BC || AD . Plan . Draw AC . To prove AB ...Page 152

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**quadrilateral**parallel to the diagonals of the**quadrilateral**, they form a parallelogram that is twice as large as the given**quadrilateral**. 9. If three angles of a**quadrilateral**are right angles , the**quadrilateral**is a rectangle ...Page 323

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**quadrilateral**. Construct a triangle equal to it . Then construct a square equal to the triangle . 2. Construct an isosceles triangle having a given base , equal to the**quadrilateral**with which you started in Exercise 1 . 3. Construct a ...### Contents

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

LinesAnglesPlanes | 11 |

W W | 24 |

Copyright | |

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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