Question

Calculate the total surface area of a cuboid whose length is $a$ units, breadth is $a^2$ units, and height is $a^3$ units.

• A. $2(a^3+a^5+a^4)$ sq. units
• B. $2(a^4+a^5+a^6)$ sq. units
• C. $2(a^6+a^4+a^2)$ sq. units
• D. None of the above

Answer 1

The correct option is A $2(a^3+a^5+a^4)$ sq. units

Total surface area of a cuboid
= $2(lb+bh+lh)$
= $2(a\times a^2+a^2\times a^3+a\times a^3)$
= $2(a^3+a^5+a^4)$ sq. units