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PROBLEM:
What is the area of a circle 3.102 cm in diameter?
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SOLUTION:
The area of a circle can be computed using the formula below when the radius is given.
A=\pi r^2
We also know that the radius is half the diameter, so the area can be calculated using the formula,
A=\pi \left(\frac{d}{2}\right)^2
So, by direct substitution
A=\pi \left(\frac{3.102\:\text{cm}}{2}\right)^2=7.557\:\text{cm}^2 \ \qquad \ \color{DarkOrange} \left( \text{Answer} \right)
The area of the circle is 7.557 square centimeters.
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