tolong yaaaa 10 sampai 14

10=?
11 = 56/2 = 28
        22/7x28x28 = 2464 ( b )
12 = jawabannya ( d )
13 = 1/2 x 24 x 10 x30 = 7200 : 2 = 3600
14 = jawabannya ( a )