## Plane Geometry: And Supplements |

### From inside the book

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**tangent**to the circle . ( b ) A**tangent**to a circle touches the circle at only one point . The circle is said to be**tangent**to the line . ( c ) Point A is the point of tangency . X Y A B 188. A straight line that is perpendicular to a ...Page 190

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**tangent**of two circles is tan- gent to each of them . It may be a common internal**tangent**like CD or a common external**tangent**like AB . There are gen- erally two of each kind . ( c ) The length of a common**tangent**is the length of it ...Page 192

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**tangent**circles termi- nates in the circles ,**tangents**to the circles at its ends are parallel . ( Prove AC || DE . ) D E B R Suggestion . Draw DBC , the common internal**tangent**. Using ADBE and ACB , prove A that ∠DEB = ZCAB . C 2 ...### 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