Question

2) Measure the diameter of the circle below (measure left to right), rounding off to the nearest mm. = 9 mm O Using the equation #r2 for area (n= 3.14), calculate the area of the circle 9mm2 x 3.14 = 254.47 mm 5 What is this in um?? Note: remember you are working with a square, so the conversion difference will be squared as well. Convert mm to um before calculating the area to confirm your answer. (1) 254.47mm? x 3.14 = 56,548.67 um

Is this correct?

is this correct?

Answer 1

If the diameter of the field (circle) is 9mm, then the radius (r) is 4.5 mm.

Thus, the area of the circle = $\pi \cdot r^{2}$ = 3.14 * (4.5)2 = 3.14 * 4.5 * 4.5 = ‭63.585‬ mm2

Now, 1 mm = 103 $\mu m$

=> ‭63.585‬ mm2 = 63.585 * (103 $\mu m$ )2 = 63.585 * 106 $\mu m^{2}$

Thus, the area of the circle in Micrometre2 is 63.585 * 106 $\mu m^{2}$