What the answer is! i'm so confused about the triangle part!

The area of this is 46 meters square because the area of the rectangle is 40 meters square, and the area of the triangle is 6 meters square, so i just add all of it together to get 46 meters square. Hoped it help! Finally, the area of the triangle is 1/2 times base times height, so we already have base is 4m and height is 3m. As a result, 1/2 times 4 time 3 equal 6 meters square. Hoped it help!