tolong banget yg penggemar MTK yg a,b,and e

a). v = 3.14 x 4 x 4 x 10 = 502.4
l = 2 x 3.14 x 4 x 10 = 251.2
b). v = 22/7 x 7 x 7 x 6 = 924
l = 2 x 22/7 x 7 x 6 = 264
e). v = 3.14 x 2 x 2 x 10 = 125.6
l = 2 x 3.14 x 2 x 10 = 125.6
semoga benar