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It is 1.5 times 90 = 135 degrees
Division of fractions is easy - just turn the second one upside down and multiply.So 2 / 5 divided by 4 / 7is equivalent to 2 / 5 times 7 / 4which is equivalent to (2 times 7) / (5 times 4)= 14 / 20 = 7 / 10
The total circumference is (arc length) times (360) divided by (the angle degrees)
50. It is always two times the rotation.
Efficiency= Mechanical Advantage Speed ratio X100 Mechanical advantage divided by speed radio X (times) 100