Question

Given that DA is a diameter of circle B, angle CBA is a right angle, and mAF=65 degrees, find mDE

Answer 1

Secret to solving geometry questions:
In geometry, start with a diagram, if the question does not provide one.
Otherwise you would be staring at the question and won't know what to do.

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In the math language, there is not a lot of redundance, so any mistake will make the question not understandable. Therefore it is important to check or proofread the question before/after posting the question. If a figure accompanies the question, post the image as well.

In trying to draw a diagram for the given question, I find the following ambiguities:
1. If DA is the diameter, any angle subtended by the chord DA on the circumference is a right angle. So if CBA is a right angle, assuming B is on the circumference, then C must coincide with D. Typo suspected.
2. mAF=65 degrees. An angle is defined by three letters, not two. Typo suspected.
3. Find mDE. Where is E, it is not mentioned/defined anywhere. Typo suspected.