In a plan with a scale of 1:4000, it is measured that the height of a triangular vegetable field is 5.5cm and the low is 8cm. What is the actual area of this triangular vegetable field

In a plan with a scale of 1:4000, it is measured that the height of a triangular vegetable field is 5.5cm and the low is 8cm. What is the actual area of this triangular vegetable field

Bottom = 4000 × 8 = 32000 cm = 320 m
Height = 4000 × 5.5 = 22000 cm = 220 M
Area = 320 × 220 × 1 / 2 = 35200 square meters