chịu là rfggggggggggggggggggggggggggggggggggssssssssssssssssssserrrrrrrrrrrrrrrrrrhhhhhhhhhhhhhhheeeể
số e là xấu ấy
111111111111111111111111111111111111111111111111111111111111111111111
ban kinh cua hinh ban hguyet la 51.4:2=25.7
=>dien h cua hinh ban nguyet la :25.7x25.7=660.49
157 cm2 nha ban mk chac chan 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%