The area of the sheet metal needed to ma

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

The area of the sheet metal needed to make a box of size 7 cm × 8 cm × 9 cm is:

Options:

382 cm²

156 cm²

412 cm²

139 cm²

Correct Answer:

382 cm²

Explanation:

We know that,

The Total Surface area of the box = 2(lb + bh + lh)

We have,

Length of the box = 7 cm

Breadth of the box = 8 cm

Height of the box = 9 cm

The Total Surface area of the box = 2(7 × 8 + 8 × 9 + 9 × 7) = 2(56 + 72 + 63) = 382 cm²