A student needs to determine the total area on a slide covered by a certain bacteria. If the slide contains three circular colonies with diameters of 0.52 mm, 2.65 mm, and 3.10 mm, what is the total area of the three colonies to the correct number of significant figures?
Answer:
1..0.26 x 0.26 x 3.14 = 0.212 mm²
2..1.325 x 1.325 x 3.14 = 5.512 mm²
3..1.55 x 1.55 x 3.14 = 7.544 mm²
Total area = 7.544 + 5.512 + 0.212 = 13.27 mm²
Can we ignore the depth of the colonies? If so it is simply area of a circle; A = pi * r^2
You might have better luck with this in Biology.
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