In circle r, rd(line over it) is a radius and df (line over it) is a tangent segment which statement must be true? a)rd= df b)rd = rf c)triangle rdf is a right triangle d)triangle rdf is an obtuse triangle

We'll have an attached picture (Ignore the labeling). We can easily observe that DF (in the picture BC), cannot be equal to the radius. Then, we cannot also claim that RD=RF. And since we are talking about the tangent segment, we'll have a right triangle. The correct answer is C)

The answer maybbe c