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2.8 Find The Missing Angle!
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2.8 Find The Missing Angle!

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triangles, quadrilaterals

triangles, quadrilaterals

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2.8 Find The Missing Angle! 2.8 Find The Missing Angle! Presentation Transcript

  • Find the missing angle!11/16/09
    EQ: How do I find the missing angle in a triangle or quadrilateral?
  • Review:
    Go over assignment
  • Review:
    Acute angle:
    An angle less than 90 degrees
  • Review:
    Right angle:
    An angle exactly 90 degrees
  • Review:
    Obtuse angle:
    An angle greater than 90 degrees
  • Review:
    Straight angle:
    An angle exactly 180 degrees
  • Review:
    Complementary angles:
    2 angles equal 90 degrees
  • Review:
    Supplementary angles:
    2 angles equal 180 degrees
  • Review:
    Interior angles in a triangle equal:
    180 degrees
  • Review:
    Equilateral Triangle:
    All sides same
    All Angles same
  • Review:
    Isosceles Triangle:
    Two sides same
    Two Angles same
  • Review:
    Scalene Triangle:
    No sides same
    No Angles same
  • Review:
    Interior angles in a quadrilateral equal:
    360 degrees
  • If you are given 2 angles in a triangle, how do you find the third one?
  • <A + <B + <C = 180
    So
    180 - <A - <B = <C
  • Find the missing angle measure:
  • 52 + 48 =
    100
    180 – 100 = 80
  • Find the missing angle measure:
  • 60 + 40 =
    100
    180 – 100 = 80
  • Find the missing angle measure:
  • 35 + 70 =
    105
    180 – 105 = 75
  • One angle on a right triangle is 40o.
    What is the 3rd <?
    50
  • What is the measure of each angle in equilateral triangles?
    60
  • Do problems 1 & 2 on Find the Missing Angle.
  • If you are given 3 angles in a quadrilateral, how do you find the fourth one?
  • <A + <B + <C + <D = 360
    So
    360 - <A - <B - <C = <D
  • Find the missing angle measure:
  • 80 + 80 + 100 =
    260
    360 – 260 = 100
  • Find the missing angle measure:
  • 75 + 95 + 105 =
    275
    360 – 275 = 85
  • Find the missing angle measure:
  • 100 + 80 + 130 =
    310
    360 – 310 = 50
  • Find the missing angle measure:
  • Complete problems 3 & 4 on Find the Missing Angle.
  • Questions?
    Complete problem solving cards.
  • 90 + 90 + 45 =
    225
    360 – 225 = 135
  • EQ:
    How do I find the missing angle in a triangle or quadrilateral?