Answer:
204 square mm
Explanation:
Area of a triangle = (1/2)*base*height
The entire bottom is 24, but those | show that each side of the bottom of the figure are equal lengths. So 24/2 = 12. The bottom of the triangle is 12 mm.
The height of the triangle is 7+9=16
So the area of the triangle = (1/2)*12*16 = 96 square mm
The rectangle is 12 mm on the bottom (the other half of the 24 that we just divided above), and the height is 9.
Area of a rectangle = length x height = 12*9 = 108 square mm
Add them up!
96 + 108 = 204 square mm