Question

The surface area of a $(10cm\times 4cm\times 3cm)$ brick is

(a) $84c{m}^2$

(b) $124c{m}^2$

(c) $164c{m}^2$

(d) $180c{m}^2$

Answer 1

Surface area of a brick of measure

$10cm\times 4cm\times 3cm$

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

$=2[10\times 4+4\times 3+3\times 10]c{m}^2$

$=2[40+12+30]=82\times 2$

$=164c{m}^2$