Question

Three cubes each of side $5$cm are joined end to end. The total surface area of the resulting cuboid is _________.

• A. $350c{m}^2$
• B. $450c{m}^2$
• C. $300c{m}^2$
• D. $500c{m}^2$

Answer 1

Answer: (A)

$350c{m}^2$

Total Surface Area of cuboid $=2(LB+BH+HL)$

Here,

$L=15cm$

$B=5cm$

$H=5cm$

$\therefore$ Area of cuboid $=2(15\times 5+5\times 5+5\times 15)$

$=2(75+25+75)$

$=350c{m}^2$