## Plane Geometry: And Supplements |

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**diagonals**of a parallelogram bisect each other . Hyp . ABCD is a parallelogram . B**Diagonals**AC and BD intersect at E. Con . AE = EC , BE = ED E ( Plan and proof left to the pupil . ) A D C 127. The center of a parallelogram is the ...Page 125

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**diagonals**of a rectangle bisect each other ? Why ? 4. Prove that each angle of a rectangle is a right angle . 5. Prove that the**diagonals**of a rectangle are equal . 6. Are the**diagonals**of every parallelogram equal ? 7. Prove that a ...Page 126

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**diagonals**of a square are perpendicular to and bisect each other . 4. Prove that each**diagonal**of a square bisects the angles through which it is drawn . 5. A quadrilateral is a square if its**diagonals**are equal and are per- pendicular ...### 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