Help!In the figure below, triangle ABC is an equilateral triangle, and quadrilateral DEFB is a square. What is mABD? A. 45° B. 30° C. 50° D. 20° the figure is below

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asked Jul 28, 2016 191k views

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

What is mABD?
A. 45°
B. 30°
C. 50°
D. 20°
the figure is below

Help!In the figure below, triangle ABC is an equilateral triangle, and quadrilateral-example-1

Mathematics
middle-school

Ganesh Manoj asked

by Ganesh Manoj

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1 Answer

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$m\angle ABD=m\angle CBD-m\angle ABC\\ m\angle CBD=90\\ m\angle ABC=60\\ m\angle ABD=90-60=30\Rightarrow B$

Marilia answered Aug 3, 2016

by Marilia

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