Hitunglah luas bangun !

L =

[tex] \frac{1}{2} \times \pi \times {r}^{2} [/tex]
[tex] \frac{1}{2} \times \frac{22}{7} \times {21}^{2} [/tex]

[tex] \frac{11 \times 21 \times 21}{7} [/tex]
[tex]11 \times 21 \times 3[/tex]
Luas = 693cm²