Question

2. Why can no angle on the drawing at the right be referred to at ∠A?
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Answer 1

Because different lines meet at A forming different angles

Explanation:

Let the unlabeled point on the diagram be E

In the attached diagram, you notice that line BA, CA, DA and EA meets at A;

These lines form different angles which are BAC, BAD, BAE, CAB, CAD, CAE, DAC, DAB, DAE, EAD, EAC, EAB

Because of the numerous angles formed at A, no angle can be referred to as <A