The diameter of the circle is d = 21 cm.
The formula for the area of circle is,
[tex]A=\frac{\pi(d)^2}{4}[/tex]
Determine the area of circle of diameter 21 cm.
[tex]\begin{gathered} A=\frac{\pi(21)^2}{4} \\ =\frac{22}{7}\cdot\frac{21}{4}\cdot21 \\ =11\cdot\frac{3}{2}\cdot21 \\ =346.5 \end{gathered}[/tex]
Thus area of circle is 346.5.
