AMO 2027 Grades 8-9 SET 5 - Self-study Question 3

Question 3

In the figure, $\angle A$, $\angle B$, and $\angle C$, are right angles. If $\angle AEB=40^\circ$ and $\angle BED=\angle BDE$, then $\angle CDE=$

Question illustration

$80^\circ$
$85^\circ$
$90^\circ$
$95^\circ$
None of the above