I would solve this problem by subtracting the area of the temple and apron from the total area.
The total area is found by adding the apron + moat to temple length and width.
The apron (30) and moat (190) is added twice to both length and width.
Total length = 1025 + 2(30) + 2(190)
L = 1465 m
Total Width = 802 + 2(30) + 2(190)
W = 1242 m
Total Area = L × W
= 1,819,530 m²
temple + apron
l = 1025 + 2(30)
=1085 m
w = 802 + 2(30)
= 862 m
Area of temple + apron
= 1085 × 862
= 935,270 m²
Area of Moat = total area - (area of temple + apron)
Area of moat = 1,819,530 m² - 935,270 m²
= 884,260 m²
