Answer:
Length of arc AB = 4π
Step-by-step explanation:
Formula to get the arc length is given by,
Length of arc =
Here, θ = central angle subtended by the arc AB
r = Radius of the circle
By substituting the values in the formula,
Therefore, length of arc AB =
= 40π
The fraction 8/21 cannot be simplified because the numerator and denominator don't have a common factor except 1.
Thus, the final answers are 1 and -1/8.
100