What is the last angle in the triangle ACE? You already know two, so you can find it.
The other angle at A can then be found since the two angles at A add up to 90°.
Now you know two angles in AEB, and you can find the remaining.
The general idea to solving these questions is that when you know two angles in a triangle, you can find the last, and when you know that two angles add up to 90° or 180°, you can find the other one.
What is the last angle in the triangle ACE? You already know two, so you can find it.
The other angle at A can then be found since the two angles at A add up to 90°.
Now you know two angles in AEB, and you can find the remaining.
The general idea to solving these questions is that when you know two angles in a triangle, you can find the last, and when you know that two angles add up to 90° or 180°, you can find the other one.