I need the surface area of each and pls tell me what a lateral area is

http://easycalculation.com/maths-dictionary/lateral_area.html

There were a couple of different definitions.  It was a bit confusing.

I think for prism you don't include the two ends and for pyramids you don't include the bottom.

I don't think i have heard the term lateral surface area before.

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Now I will look at the first one.

The top and bottom are right angled triangles.  They are the same.  The sides are 6,8 and 10km

so the area is 2 * (1/2 * 6 * 8) = 2*(24) = 48km²

The other 3 sides are rectangles the total area is (4*6)+(4*8)+(4*10) = 24+32+40=96km²

Total area = 48+96 = 144km²

Lateral area = 96km²