Frist,find the measure of tne third side of the triangular base.

                        (Pythagorean theorem)

                 (Substitute )

                      (Evalute powers)

                            (Add: )

                                (Taking square root)

Perimeter:

                    (Substitute )

                                (Add: )

Lateral area(L):

                                (Lateral area of prism)

                     (Substitute )

                              (Multiply: )

Area(B):

                           (Lateral area of prism)

                    (Substitute )

                                (Simplify)

Surface area:

                          (Surface area of prism)

               (Substitute )

                     (Multiply: )

                             (Add: )

The surface area is 336 square feets.