11/18/09 do now have your homework out on your desk. find all of the angle measures below
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11/18/09Do Now Have your homework out on your desk. Find all of the angle measures below.
<1
100°80°(x+5)°
70°(x-5)°
<4
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11/18/09 Do Now Find all of the angle measures below.
<1
100°80°(x+5)°
70°(x-5)°
<4
<1 + 70° = 100°<1 = 30°
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11/18/09 Do Now Find all of the angle measures below.
<1
100°80°(x+5)°
70°(x-5)°
<4
(x-5)° + (x+5)° = 80°x + x - 5 + 5 = 802x = 80x = 40
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11/18/09 Do Now Find all of the angle measures below.
<1
100°80°(45)°
70°(40-5)° = 35°
<4
100° + 45° + <4 = 180°145° + <4 = 180°<4 = 35°
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Homework Answers Side B#13)<1 = 36
<2 = 122
<3 = 122
<4 = 38
#14)<1 = 50
<2 = 90
<3 = 60
<4 = 60
<5 = 60
<6 = 60
<7 = 110
#15)<A = 60
<B = 30
<C = 90
#16)<A = 83
<B = 38
<C = 59
#17)<A = 40
<B = 50
<C = 90
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Homework Answers Side C#8)<1 = 75
<2 = 55
<3 = 55
<4 = 40
<5 = 140
<6 = 40
<7 = 75
<8 = 65
<9 = 115
#9)<1 = 30
<2 = 60
<3 = 50
<4 = 35
<5 = 90
<6 = 55
<7 = 55
<8 = 125
<9 = 35
#10)<A = 30
<B = 60
<C = 90
#11)<A = 64
<B = 67
<C = 49
#12)<A = 100
<B = 50
<C = 30
#13) 131
#14) 100
#15) 125
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4-7: Isosceles Triangles
Objective: Use properties of Isosceles Triangles
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Angles of an Isosceles Triangle
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Base Angles Theorem - The base angles of an isosceles triangle are congruent.
CB
A
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Generalization:
Congruent angles within a triangles are opposite congruent sides of a triangle.
The converse is also true.
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Ex. 1: Solve for x and y.
x°
58°
y°
F
E
D
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Ex. 2: Solve for x.
2x + 10°
7x - 5°
F
E
D
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Ex. 3: Solve for x and y.
D
L
I
EF
y°
x°
70°
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Homework
WS 1 – 6 (Both Sides)