The center of a hyperbola is located at the origin. One focus is located at (0, 20), and its associated directrix is represented by the line

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

mujhko hui na

3/8

answer is  

a.

7 in. x 11 in.

hope you get this right.