Answer: 12.9
Explanation:
We first find the surface area of every single triangle. The area of a triangle and be shown as b*h/2, where b is base and h is height.
2*3/2 = 3
multiply by 3 since there are three of these sides.
3 * 3 = 9
find the area of our base
3*2.6/2 = 3.9
Add them all up
3.9 + 9 = 12.9