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# 2.8 Find The Missing Angle!

## on Nov 17, 2009

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## 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?
• &lt;A + &lt;B + &lt;C = 180
So
180 - &lt;A - &lt;B = &lt;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 &lt;?
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?
• &lt;A + &lt;B + &lt;C + &lt;D = 360
So
360 - &lt;A - &lt;B - &lt;C = &lt;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?