## Plane Geometry: And Supplements |

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Page 213

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**similar**triangles . ( a ) Two polygons are**similar**( ~ ) if their corresponding angles are equal and their corresponding sides are proportional . B C B ' C ' A A ' E D E ' D ' Thus ...**similar**if two angles of one**SIMILAR**POLYGONS 213.Page 215

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**similar**to ARST . A 2. ( a ) DE || BC in ∆ABC . Prove ∆ADE**similar**to ∆ABC . D E ( b ) State part ( a ) as a theorem . B C 3. Do Ex . 2 if DE || BC but cuts BA and CA ex- tended through A. 4. In ∆XYZ , XD and ZE are altitudes . X ...Page 400

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**similar**? E 160. In trapezoid ABCD with bases AD and BC , diagonals BD and AC intersect at O. If BO = 3 , OD = 6 , AO = 8 , and OC = 4 . ( a ) Are AADO and CBO**similar**? ( b ) If ∆ABO ~ △ CDO , what angle does ∠BAO equal ? 161. In ...### 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