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Sagot :

Answer: 12.9

Step-by-step 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