[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
Answer from: Quest
With a continuous thought process.
Answer from: Quest
Hello! i hope this since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.