tolong bantuannya bagi yg peduli ps:dgn caranya yah

[tex]a. \\diameter = 2 \times 7 = 14 cm \\ luas \: alas = \frac{22}{7} \times 7 \times 7 = 154 {cm}^{2}\\ volume = \frac{22}{7} \times 7 \times 7 \times 10 = 2464 {cm}^{3} \\ b. \\ r = \frac{50}{2} = 25cm \\ luas \: alas = \frac{22}{7} \times 25 \times 25 = 1964.29 {cm}^{2} \\ volume = \frac{22}{7} \times 25 \times 25 \times 30 = 58928.57 {cm}^{3} \\ c. \\ luas \: alas = \pi \times r \times r \\ 55 = \frac{22}{7} \times {r}^{2} \\ 385 = 22 {r}^{2} \\17.5 = {r}^{2} \\ r = 4.18 \\ volume = \pi \times r \times r \times t \\ 11000 = \frac{22}{7} \times 4.18 \times 4.18 \times t \\ t = 200.31 \\ d. \\ e. \\ 484000l = 484 {m}^{3} \\ volume = \pi \times r \times r \times t \\ 484 = \frac{22}{7} \times {r}^{2} \times 1.4 \\ r = 10.49 \\ diameter = 2 \times 10.49 = 20.98m \\ luas \: alas = \frac{22}{7} \times 10.49 \times 10.49 = 345.84 {m}^{2} \\ f. \\ r = \frac{2.5}{2} = 1.25m \\ luas \: alas = \frac{22}{7} \times 1.25 \times 1.25 = 4.91 {m}^{2} \\ volume = \frac{22}{7} \times 1.25 \times 1.25 \times 3.5 = 17.1875 {m}^{3} \: ubah \: ke \: liter = 17187.5 \: l \\ g. \\ r = 0.35dm = 3.5cm \\ d = 3.5 \times 2 = 7cm \\ volume = \pi \times r\times r \times t \\ 192.5 = \frac{22}{7} \times 3.5 \times 3.5 \times t \\ t = 5cm \\ h. \\ diameter = 14 \times 2 = 28 \\ luas \: alas = \frac{22}{7} \times 14 \times 14 = 616 {cm}^{2} \\ volume = \frac{22}{7} \times 14 \times 14 \times 12 = 7392 {cm}^{3} \\ i. \\ luas \: alas = \pi \times {r}^{2} \\ 154 = \frac{22}{7} \times {r}^{2} \\ r = 7 \\ diameter = 2 \times 7 = 14 \\ volume = \frac{22}{7} \times 7 \times 7 \times 5 = 770 {cm}^{3} [/tex]
yang d saya tidak bisa
maaf kalo salah, semoga membantu
(*gk sepenuhnya benar kayaknya karena bingung atas satuannya dan hitungan komanya)