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deff fn [24]
4 years ago
15

Help pls i give u brainliest and 5 stars​

Mathematics
2 answers:
Vesnalui [34]4 years ago
5 0

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

Mrrafil [7]4 years ago
5 0

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

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