Math problem giving 20 points and

I think its the second one from the options search on Google just in case I'm sorry if you get this wrong because of me.Btw I think it the second one.

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "

x/3-10=8

x/3=18

x=48