line that touches a circle at exactly one point.
Line or segment that touches only two points on the circle.
an angle that touche the circle
a line segment that is half the width of the circle
a line segment that goes thru the middle of the circle and to the opposite side of the circle
how big the angle is times 2
it is a round sphere
distance around the circle
angle that starts from the center of the circle
a line that goes from one side to the other without going outside the circle