tolong dijawab ya kak pleaseee besok dikumpulkannya (pakai caranya)

1 a. 22/7x21x21=1386
b. 3.14x25x25=1,962.5
c. 22/7x3.5x3.5=38.5
2.a.3.14x25x25=1,962.5
b. 22/7x17.5x17.5=1210
3.a.22/7x7x7=154
14x14=196
196-154=42
b. 3.14x5x5=78.5
10x10=100
100-78.5=21.5