First you must make sure all measurements are in the same value: You can choose either cm or km
Distance = 1,000,000 cm or 10 km
Radius = 50 cm or 0.0005 km
Distance/(2πR)
1,000,000/(2π*50)
1,000,000/314.059…….
Approx = 3183.1 Rotations
9 x 9 = 81
81 - 21 = 60
60 / -6
10
Answer:
Step-by-step explanation:

3 because 3•3 is 9 and 9•3 is 27