## Plane Geometry: And Supplements |

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Page 204

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**ratio**of 2 to 3 is 23 , or . Generally write**ratios**in fractional form . ( b ) The**ratio**of a to b often is written ab . Therefore , 2 : 5 means . This method is convenient in a printed book ...**ratios**are 204**RATIO**AND PROPORTION.Page 211

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**ratio**= AD AE 4 That is , one side of the triangle is to its upper segment as the other side is to its upper segment . DB EC ( c ) = because , in the figure , each**ratio**= AD AE ៖ 3 4 DB EC 3 ( d ) = because each**ratio**= AB AC 7 AD ...Page 220

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**ratios**equal , it is necessary often to prove each of them equal to some third**ratio**. This theorem proves that the**ratio**of two corresponding altitudes of similar triangles equals the**ratio**of similitude of the triangles ( §244 ( c ) ...### 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