ho_ten = input("Nhap ho va ten hoc sinh: ")

toan  = float(input("Diem thi toan: "))

van  = float(input("Diem thi van: "))

anh = float(input("Diem thi anh: "))

t = toan*2 + van + anh

print("Trung binh ba mon: ", t/3)

tong=float(input("Tong: "))

hieu=float(input("Hieu: "))

a=(tong+hieu)/2

b=tong-a

print(a,b)

cd = int(input("Nhap chieu dai: "))

cr = int(input("Nhap chieu rong: "))

cv = (cd + cr)*2

s = cd * cr

print("Chu vi hinh chu nhat: ", cv)

print("Dien tich hinh chu nhat: ", s)

r = int(input("Nhap vao ban kinh duong tron: "))
cv = float(2*r*3.14)
s = float(r*r*3.14)
print("Chu vi: ",cv)
print("Dien tich: ",s)