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

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

What is the missing step in this proof ?

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?