Infosys Company Numerical Ability Geometry

If the circumference of a circle is 100 units, Then what will the length of the arc described by an angle of 20 degree?

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Infosys Other Question

Three independent mechanisms A,B and C have been incorporated for fuel saving in a car producing respectively 30%, 20%, and 40% efficiency. Assuming that they operate independently, what is the net fuel efficiency achieved? Given d value of log 3.142 & log 3.143.
to find the value of log 3.141