What is the total surface area of a cubo

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

What is the total surface area of a cuboid whose length, breadth and height are 7 cm, 5 cm and 9 cm, respectively?

Options:

190 cm²

403 cm²

286 cm²

386 cm²

Correct Answer:

286 cm²

Explanation:

We know that, TSA(Cuboid) = 2 x (LB + BH + HL)

Length, = 7 cm

Breadth = 5 cm

and height =9 cm

TSA = 2 x [(7)(5) + (5)(9) + (9)(7)]

TSA = 2 x [35 + 45 + 63]

TSA = 286 cm²