Question

find the surface area of a cuboid L = 20cm,b
= 15cm, h = 4cm

Answer 1

Surface area = Lbh

= 20×15×4

= 1200 cm

Answer 2

Step-by-step explanation:

$\bm{\mathcal{\large{\green{\underline{\underline{given}}}}}} \\ \large \blue{length \: of \: cuboid \: = \: 20 \: cm} \\ \large \blue{breadth \: of \: cuboid \: = \: 15 \: cm} \\ \large \blue{height \: of \: cuboid \: = \: 4 \: cm} \\ \mathfrak{\large{\green{\underline{\underline{solution}}}}} \\ \large \pink{surface \: area \: of \: cuboid \: = \: 2(lh \: + \: bh \: + \: lb)} \\ \large \pink{surface \: area \: = \: 2(20 \times 4 \: + 15 \times 4 \: + 20 \times 15)} \\ \large \pink{surface \: area \: = \: 2(80 \: + \: 60 \: + \: 300)} \\ \large \pink{surface \: area \: = \: 2 \times 440} \\ \large \pink{ => \: surface \: area \: of \: cuboid \: = \: 880 \: {cm}^{2}}$