Question

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

Answer 1

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)