Geometry Ch. 6

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Quadrilaterals

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12 Terms

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Formula for: Sum of int. ∠’s

180(n-2)

n=# of sides

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Sum of ext. ∠’s=?

360

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Int ∠+ Ext ∠=?

180

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Properties of Parallelograms

  1. Opp. sides r ≅, II

  2. Opp. ∠’s r ≅

  3. / bisect each other

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Properties for rectangles

parallelogram that has:

4 right ∠’s, / r ≅

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Properties for rhombus

  1. A parallelogram that has:

    1. 4 ≅ sides

    2. / r II

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Properties of squares:

  1. Parallelogram

  2. Rectangle

  3. Rhombus

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Median of trapezoid formula

base 1 + base 2 / 2

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number of sides w interior angle- given number 150

180-150=30, 360/30=12

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m<ext. angle given-12gon

360/12=30

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find number of sides w interior angles- 144

180-144=36, 360/36=10

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find int. angle and ext. angle, given- 6 sides

int angle- 180×4=720/6=120

ext. angle- 360/6=60