"which step should be used to prove that point a is equidistant from points c and b?
in triangles abd and acd, all three angles are equal.
in triangles abc and abd, one side and one common angle are equal.
in triangles abc and adc, two sides are unequal.
in triangles abd and acd, two sides and an included angle are equal. "

So based on the given figure above, the step that should be used to prove that point A is equidistant from points C and B is that, in triangles ABD and ACD, two sides and an included angle are equal. If sides AC and AB are equal, therefore, the angles ADC and ADB is also equal, which makes point A, equidistant to point C and B. Hope that this answer helps.

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Step-by-step explanation: