A car has two wipers do not overlap . Each wiper has a blade of length 25cm sweeping through an angle of 115 degree. Find the total area cleaned at each sweep of the blades.
A student measure the thickness of human hair by looking at it through a microscope of magnification 100 he makes 20 observation and finds that the average width of the hair in the field of view of the microscope is 3.5 mm what is the estimate on the thickness of hair
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