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Seven equal cubes each of side 5 cm are joined end-to-end. Find the surface area of the resulting cuboid.

A) 750 sq cm
B) 1500 sq cm
C) 2250 sq cm
D) 700 sq cm

Correct Answer:

A) 750 sq cm

Description for Correct answer:

Given, l = Length of the cuboid

= \( \Large 5 \times 7 \) = 35 cm

b = Breadth of the cuboid = 5 cm

h = Height of the cuboid = 5 cm

Therefore, Surface area = \( \Large 2 \left(lb + bh + lh\right) \)

= \( \Large 2 \left[35 \times 5 + 5 \times 5 + 35 \times 5 \right] \)

= \( \Large 2 \left[ 175 + 25 + 175 \right] \)

= \( \Large 2 \times 375 \) = 750 sq cm

Part of solved Volume and surface area questions and answers : >> Elementary Mathematics >> Volume and surface area

Comments

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