Circle area circumference

The diameter of the circle is 6.8 cm. Calculate the area of the circle to 1 decimal place. Calculate the circumference of the circle to 1 decimal place.

Final Answer:

S =  36.3 cm²
o =  21.4 cm

Step-by-step explanation:

$$\begin{gathered} d=6.8\text{cm} \\ r=d/2=6.8/2=\frac{17}{5}=3.4\text{cm} \\ S=\pi \cdot r^2=3.1416\cdot 3.4^2=36.3{\text{cm}}^2 \end{gathered}$$

$o=\pi \cdot d=3.1416\cdot 6.8=21.4\text{cm}$

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