Answer:
B
Step-by-step explanation:
If we draw another vertical line on the other side, we can split this into a rectangle and two triangles. The width of the rectangle is 5 m, so the base of the triangle on the left is 1 m, just like the triangle on the right.
The area is therefore the sum of the areas of each shape:
A = Arectangle + 2Atriangle
A = (5 m)(3 m) + 2(½ (1 m)(3 m))
A = 18 m²
