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Across 6. An arc of a circle that measures greater than or equal to (radians) 9. An arc of a circle having measures less than or equal to (radians) 11. A plane curve ata a given point is the straight line that "just touches" the curve at the point 17. The radian measure of a central angle of a circle is defined as a ratio of the length of the arc the angle subtends 21. Whose endpoints are the points of tangency and the fixed point outside the circle are equal 22. End points both lie on the circle

Down 1. An area or portion that is distinct from others 2. States the measures of two adjacent arcs can be added 3. A line segment that bisects one of the vertex angles of a triangle 4. Passes through the center of a circle is called a diameter, and is the longest chord 5. The ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right triangle) 7. All corresponding angles are congruent. The ratios of the measures of corresponding sides are equal 8. A straight or plane that touches a curve or curved surface at a point, but if extended does not cross at that point 10. An angle formed by two chords in a circle which have a common endpoint 12. Two or more arcs n congruent circles are congruent if they have the same angle measure 13. The segment contained by a secant segment with an endpoint on the circle and at the fixed point outside the circle whose points all lie outside the circle 14. The arc that is formed when segments intersect portions of a circle and create arcs 15. In a circle is a polygon, vertices of which are placed on a circumference 16. An angle whose vertex is the center O of a circle and whose sides are radii intersecting the circle in two distinct points 18. A segment with one endpoint on a circle, one endpoint outside the circle,and one point between these points that intersects the circle 19. The segment of a circle is the region bounded by a chord an the arc subtended by the chord 20. Half of a sphere