Question

Find the surface area of a $10cm\times 4cm\times 3cm$ brick:

• A. 84 sq. cm
• B. 124 sq.cm
• C. 164 sq.cm
• D. 180 sq.cm

Answer 1

The correct option is C 164 sq.cm

The formula for calculating the surface area of a cuboid of dimensions :

$l\times b\times h$ is :

$2\times (l\times b+b\times h+h\times l)$

Substituting,

$l=10cm$

$b=4cm$

$h=3cm$

Surface area = $2\times (10\times 4+4\times 3+3\times 10)$

$=2\times (40+12+30)$

$=2\times 82{cm}^2$

$=164{cm}^2$

Hence, the answer is option (C)