Decide how big the unmarked angles are in these isosceles triangles.
Please enable Java for an interactive construction (with Cinderella).
Angle ABC is
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80
110
130
140
150
Angle DFE is
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30
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60
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75
80
110
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Angle FED is
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30
40
50
60
70
75
80
110
130
140
150
Decide how big the unmarked angles are in these isosceles
triangles.