# print("Hello World  sssss!!!")
# Input=input('Nhap cai gi vao cho don gian :')
# number=int(1)
# print(int(number))

print('Tinh dien tich tam giac')
day=float(input('Nhap do dai day cua tam giac:'))
cao=float(input('Nhap chieu cao cua tam giac:'))
S_tamgiac= day*cao*0.5

print("Dien tich hinh tron:",S_tamgiac)

print('--------------------------------')

print('Tinh dien tich hinh tron! theo cong thuc pi*d')
duongkinh=float(input('Nhap duong kinh:'))
S_tron=3.14*duongkinh
print(S_tron)
