tolong di jawab dan kasih tau caranya yaaah..

6. 12*15/2*24=2.160 cm
7.14*9/2*26   =1.638 cm
8.12*16/2*30 =2.880 cm
9.  5*6/2*8      =120 cm
10.8*6/2*18   =432 cm
11.15*20/2*22=3.300cm
12.10*16/2*30=2.400 cm
13.12*18/2*47=5.076 cm