## Plane Geometry: And Supplements |

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Page 90

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**extended**. ( c ) Find two lines that are not coplanar . Can they ever intersect ? 83. ( a ) Parallel lines are coplanar C D lines that do not intersect no mat- ter how far they are**extended**, as AB and CD . The symbol for is parallel to ...Page 401

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**extended**at X , and AC**extended**at Y. Prove ABC similar to ∆AXY . Suggestion . Prove ∠Y = ZABC . ☆ 174 . If E is the mid - point of one of the parallel sides BC of trapezoid ABCD , and AE and DE**extended**meet DC and AB**extended**at F ...Page 402

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**Extend**CA through A to E so that AE = CA. Draw BE and prove ∠CBE is a right angle . 186. Let ABCD be any rectangle . Draw BE 1 AC , meeting CD**extended**at F , and FG | BA**extended**at G. Prove BC is the mean proportional between AB and ...### 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