129 units²
The surface area is the area of all the surfaces basically.
so the three rectangular sides are 7 by 5, which gives you 35.
There's three of them, so 105.
There are also two triangular sides that are 6 by 4.
equation to find area of triangle is [tex]\frac{1}{2}[/tex]b · h, which is a fancy equation for half base times height.
so base times height, 24. Half is 12.
There are two sides, so 24 units squared.
105+24 is 129.
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