Working with Circles Test Choose the best answer. 1. Which points of a circle are on the same plane? only the center point and points on the circle points on the circle but no interior points the center point, interior points, but no points on the circle all the points in and on a circle 2. In a circle, a radius is the same length of a radius in a congruent circle. extends outside the circle. is twice the length of a diameter. determines an arc. 3. Congruent circles have the same center point. have diameters of the same length. (1) have radii of the same length. (2) (1) and (2) Use the figure below to answer question 4. 4. Which point(s) is an exterior point? A, B, C D, E, F, G H A, E, G, H 5. •A lies 12 inches from the center of P. If P has a 1-foot radius. •A lies inside the circle. on the circle. outside the circle. between concentric circles. 6. A diameter is also a radius an arc a chord a line 7. Both tangents and radii extend from the center of a circle. are half a circle's length. meet a circle at exactly one point. are straight angles. 8. From a stationary point, Billy throws four balls in four directions. Where each ball lands determines the radius of another circle. What do the four circles have in common? a center point a radius a diameter a tangent 9. Which circle is NOT congruent? 10. In which figure is the set of arcs not congruent? Choose the best answer. 11. What is the circumference of the figure below? 57π inches 114π inches 26.5π inches √57π inches 12. What is the area of the figure below? 51.5π square feet 103π square feet 206π square feet 10,609π square feet 13. 8 centimeters 16 centimeters 32 centimeters 64 centimeters 14. The area of a square is 484 square feet. What is the maximum area of a circle inscribed in the square? 11π square feet 22π square feet 484π square feet 122π square feet 15. If the circumference of a circle is 192π feet, then the length of the circle's radius is 16√6 feet. 96 feet. 192 feet. 384 feet. 16. If the area of a circle is 289π square feet, then the length of the circle's radius is 17 feet. 34 feet. 144,5 feet. 289 feet. 17. What is the area of a circle inscribed in a dodecagon with an apothem 13 meters long? 26π meters. 156π meters. 42,2π meters. 169π meters. Use the figure below to answer questions 18 through 19. 18. The arc BD is a quarter of the circumference of C. If the total circumference of C is 64π feet, then what is the length of the arc BD? 16π feet 32π feet 48π feet 90π feet 19. What is the central angle that intercepts the arc BD? an acute angle a right angle an obtuse angle a straight angle 20. What is the area of the shaded figure? 144 square feet - 12π square feet 12 square feet - 144π square feet 144 square feet 144 square feet - 24π square feet + 12π square feet Use the figure below to answer questions 22 through 23. 21. What is the area of the shaded figure? 56.25π square feet 112.5π square feet 225π square feet 337.4π square feet 22. What is the ratio of the area of circle M and the area of circle K? 1:8 1:4 1:2 1:1