Find the surface area of the triangular prism below.​

Surface area of the triangular prism = 186.984 feet²

Step-by-step explanation:

Surface area of the triangular prism is given by the expression,

Surface area = (Perimeter of the triangular base)×Height + Area of the triangular bases

Perimeter of the triangular base = (9.8 + 8.5 + 6.2)

                                                      = 24.5 ft

Height of the prism = 5.5 ft

Area of the triangular base =

                                             =

                                             = 26.117 square feet

Surface area of the prism = (24.5 × 5.5) + (26.117 × 2)

                                           = 134.75 + 52.234

                                           = 186.984 square feet

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

yes

step-by-step explanation: