Nomor 24 berapa ya? Tolong jawab yaa

Rumus setengah lingkaran :
[tex] \frac{\pi {r}^{2} }{2} \\ = \frac{ \frac{22}{7} \times {3.5}^{2} }{2} \\ = \frac{ \frac{22}{7} \times 12.25 }{2} \\ = \frac{38.5}{2} \\ = 19.25 {cm}^{2} [/tex]
semoga membantu~