The formula to calculate the house area (HA) is:
\[ HA = HL \times HW \]
Where:
Let's say the house length is 50 ft and the house width is 30 ft. Using the formula:
\[ HA = 50 \times 30 \]
We get:
\[ HA = 1500 \]
So, the house area (\( HA \)) is 1500 ft2.
