Question

Five cubes of side 4 cm are joined together side by side to form a cuboid, find the total surface area of the resultant cuboid.

• A. $372c{m}^2$
• B. $352c{m}^2$
• C. $472c{m}^2$
• D. $292c{m}^2$

Answer 1

The correct option is B $352c{m}^2$


Given: Edge of cube = 4 cm.
So, by joining 5 cubes side by side, total length will become 20 cm. The breadth and height remain same.
So,
length of resulting cuboid (L) $=5\times 4=20cm$.
breadth of resulting cuboid (B) = 4 cm.
height of resulting cuboid (H)= 4 cm.
Total surface area of cuboid
= 2( LB + BH + HL)
$=2(20\times 4+4\times 4+20\times 4)$
$=2(80+16+80)$
$=352c{m}^2$