## Plane Geometry: And Supplements |

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**frustum**of the pyramid . ( b ) The lateral faces of a**frustum**of a regular pyramid are en- closed by congruent isosceles trapezoids . ( c ) The altitudes of the lateral faces of a**frustum**of a regular pyramid are equal and any one is ...Page 361

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**frustum**formed ? ( b ) What is the perimeter of the upper base ? ( c ) What is the lateral area of the**frustum**? 3. ( a ) How long are the elements of a right circular cone when the altitude is 25 in . and the radius of the base is 15 ...Page 365

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**frustum**A'D . 3. What is the lateral area of a**frustum**of a regular pentagonal pyramid ( see Ex . 1 ) if AB = 12 in . , A'B ' = 8 in . , and MM ' = 5 in . ? Exercises 1 to 3 prepare you for the following theorem . SG 76. The lateral ...### Contents

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

LinesAnglesPlanes | 11 |

W W | 24 |

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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