19. What term refers to a line segment from the center of the circle to any point on the circle? D. central angle C. radius A. chord B. center 20. How do you call an angle formed by two radii? D. inscribed angle A. radius C. central angle B. diameter 21. How do you call an angle whose vertex is on the circle? D. inscribed angle A. radius B. diameter C. central angle 22. What polygons that has six equal length sides and six interior angles of 120°? A. heptagon B. hexagon c. octagon D. pentagon 23. Which polygon from the choices that has eight equal lenghth sides and eight interior angles of 135°? A. octagon B. hexagon C. heptagon D. pentagon 24. What is used to measure the angles of a polygon? A ruler B. meter stick C. tape measure D. protractor 25. What measuring instrument used to measure the sides of a polygon? A. ruler B. meter stick C. tape measure D. protractor
