Arc.
Ark is part of the circle's circumference.
Quadrant
Arc
if you mean the point that starts at the edge of the circle and ends in the center then this is the radius (:
Semi means part of. So semi circle is part of a circle.
it means it comes in shapes
Circumduction
Diameter, cord, radious.
Pendulum
open circle menas it is not part of the solution set and closed circle means that it is part of the solution
A Closed Circle means that that number is INCLUDED in the line of numbers. An OPEN circle means the line of numbers go up to the given number , BUT does NOT include the given number.
an open circle on a number line means the answer is just less than or greater than (< or >), but a closed circle means the answer is less than or equal to, or greater than or equal to (< or > with a line under it)