Tolong di jawab sekarang ya oke pakai cara pengerjaannya oke

Tolong di jawab sekarang ya oke pakai cara pengerjaannya oke

Jawaban:

$1). : v = frac{22}{7} times {14}^{2} times 25 \ v = frac{22}{7} times 196 times 25 = 15.400 {cm}^{3} \ \ 2). : lp = 2 times frac{22}{7} times 7 times (7 + 10) \ lp = 44 times 17 = 748 {cm}^{2} \ \ 3). : 27.720 = frac{22}{7} times {r}^{2} times 20 \ 27.720 times 7 = 22 times {r}^{2} times 20 \ 194.040 = 440 times {r}^{2} \ {r}^{2} = frac{194.040}{440} = 441 \ r = sqrt{441} = 21cm \ \ 4). : lp = 2 times 3.14 times 10 times (10 + 5) \ lp = 62.8 times 15 = 942 {cm}^{2}$