I need to find its surface are help please I am really stuck and need to complete this assignment

Answer:
114.6
Step-by-step explanation:
Left Side
It's a rectangle.
L = 12 km
w = 5 km
Area = L*W= = 60
Right Side (top)
It too is a rectangle.
L = 10
W = 3
Area = L*W = 30
Triangles
Area = 1/2 * b * h
Area = 1/2 * 12 * 4.1 24.6
Total Area 114.6