Tolong di jawab................................

4.(π×20×1/4)+20
15,7+20=35,7(c)
5.(π×21×1/2)+21
33+21=54(b)
6.π×42÷3
132÷3
44(c)
maaf kalo salah (^_-)
tolong dijadiin jawaban terbaik yaa 。^‿^｡