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pickupchik [31]
3 years ago
6

Help!In the figure below, triangle ABC is an equilateral triangle, and quadrilateral DEFB is a square.

Mathematics
1 answer:
Dafna11 [192]3 years ago
8 0
m\angle ABD=m\angle CBD-m\angle ABC\\
m\angle CBD=90\\
m\angle ABC=60\\
m\angle ABD=90-60=30\Rightarrow B
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