Answer:
Surface area:
The area on the surface of a shape, so the area of the faces of the square or the area of the faces of the triangle.
(how to solve: find the area of all faces(b*h) and add them up)
Volume: the amount you can fill in that specific shape? Like, filling up a bathtub, how much water can it hold? That's volume.
(how to solve: its different for each shape, but squares are (B*W*H = Volume or V))
-A friendly 8th grader :)