Answer:
Surface area means all 6 sides
TOP side= 2 multiplied by 5
Bottom = 2 multiplied by 5
Right face = 2 multiplied by 8.1
Left face = 2 multiplied by 8.1
Back side = 5 multiplied by 8.1
front side = 5 multiplied by 8.1
10+10+16.2+16.2+40.5+40.5 = 133.4 cm ^2
Answer:
133.4 cm²
Step-by-step explanation:
The opposite faces of the cuboid are congruent, thus
front/ back = 2(8.1 × 5) = 2 × 40.5 = 81 cm²
top/ bottom = 2(5 × 2) = 2 × 10 = 20 cm²
sides = 2(8.1 × 2) = 2 × 16.2 =32.4 cm²
Thus
Surface area = 81 + 20 + 32.4 = 133.4 cm²
