Specify the following angles as acute, obtuse, right, straight, or reflex
(d) $∠ B C D$

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Solution

Explanation:
Acute angles measure is less than $90 °$
Right angles measure is $90 °$
Obtuse angles measure is more than $90 °$
A reflex angle is any angle that is more than $180 °$ and less than $360 °$
Hence, $∠ B C D$ is an obtuse angle.

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