Ada yg bisa bantu soal A dan B

Ada yg bisa bantu soal A dan B

$a.luas : ling : 1 = pi {r}^{2} \ = 3.14 times 3 times 3 \ = 28.26 {m}^{2} \ luas : ling : 2 = pi {r}^{2} \ = 3.14 times 2 times 2 \ = 3.14 times 2 times 2 \ = 12.56 {m}^{2} \ luas : yg : diarsir = 28.26 - 12.56 \ = 15.7 {m}^{2}$
$b.luas : stgh : ling. = frac{1}{2 } times pi {r}^{2} \ = frac{1}{2} times 3.14 times 3 times 3 \ = 14.13 {m}^{2} \ luas : segitiga = frac{a times : t }{2} \ = frac{6 times 7}{2} \ = 21 {m}^{2} \ luas : selurhny = 14.13 + 21 \ = 35.13 {m}^{2}$