What’s the range cuz i can’t find it?

Match the term on the left with its image or description on the right. match term definition diameter a) circle a and a line segment connecting points b and c which are on the circle. circumference b) circle a and a line segment connecting points b and c which are on the circle. radius c) a piece of the circumference of a circle secant d) two circles that share the same center. concentric circles e) the distance around a circle arc f) a segment between two points on a circle that passes through its center

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

What’s the answer ? use the picture to see the problem