A bacterial colony has a diameter of 16 mm.Calculate its cross-sectional area in mm2:_____ mm2Use the maths keyboard to write your answer in standard form and to three significant figures.
Question
A bacterial colony has a diameter of 16 mm.Calculate its cross-sectional area in mm2:_____ mm2Use the maths keyboard to write your answer in standard form and to three significant figures.
Solution
The cross-sectional area of a circle is calculated using the formula πr², where r is the radius of the circle.
In this case, the diameter of the bacterial colony is given as 16 mm. The radius is half of the diameter, so the radius of this colony is 16 mm / 2 = 8 mm.
Substituting this into the formula gives:
Area = π * (8 mm)² = π * 64 mm² = 201.06 mm²
So, the cross-sectional area of the bacterial colony is 201.06 mm². This is already in standard form and to three significant figures.
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