Let's find the area of the equilateral triangle first:
[tex] \frac{1}{2} *7.8*9[/tex]
There are two triangles - one on each end. So we multiply our previous expression by 2.
[tex] \frac{1}{2} *7.8*9 * 2 \\ =7.8*9[/tex]
Each rectangle is 75 millimeters long and 9 millimeters wide: 75*9 mm^2.
We have 3 rectangles each the same size so we multiply 75*9 by 3.
75*9*3 = 2025
2025 + 70.2 = 2095.2
