Answer:
108 units²
Step-by-step explanation:
The surface area is the sum of the areas of all the faces
There are 3 rectangular faces ( base, back and sloping face )
There are 2 congruent triangular faces ( sides )
area of base = 8 × 4 = 32 units²
area of sloping face = 8 × 5 = 40 units²
area of back = 8 × 3 = 24 units²
area of triangles = 2 × [tex]\frac{1}{2}[/tex] × 4 × 3 = 4 × 3 = 12 units²
Thus
surface area = 32 + 40 + 24 + 12 = 108 units²
