diameter 28m berapa luas lingkaran

[tex]l = \pi {r}^{2} \\ l = \frac{22}{7} \times {14}^{2} \\ l = \frac{22}{7} \times 196 \\ l = 22 \times 28 \\ l = 616 \: {m}^{2} [/tex]

28:2=14
22/7 x 14 x 14
22/1 x 7 x 14
2.156
^.^