1. A lecture period (50 min) is close to 1 microcentury. (a) How long is a microcentury in minutes? (b) Using percentage difference = ( actual − pproximation actual ) 100, find the percentage difference from the approximation. 2.Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference in kilometers, (b) its surface area in square kilometers, and (c) its volume in cubic kilometers?

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Estimate of calculation