Question

Find the surface area of cuboid if the
length, breadth and height are 4 cm, 3 cm
and 12 cm respectively.​

Answer 1

Answer:

l=4

b=3

h=12

surface area of cubiod=2(lb+bh+lh)

=2(4×3+3×12+4×12)

=2(12+36+48)

=2×96

surface area of cubiod=192cm²

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Answer 2

CSA { Curved surface Area }

Formula to be used :-

$\rm \pink{CSA \: of \: cuboid \: = 2H( L + B )}$

Given,

Length = 4 cm

Breadth = 3 cm

Height = 12 cm

CSA = 2H ( L + B )

⟹ 2× 12 ( 3 + 4 )

⟹ 24 ( 7 )

$\therefore$ 168 cm² [Ans]

━━━━━━━━━━━━━━━━━━━━━━━━━━━━

TSA {Total surface Area }

Formula to be used :-

$\rm \pink{TSA \: of \: cuboid \: = 2(LB + BH + LH )}$

Given,

Length = 4 cm

Breadth = 3 cm

Height = 12 cm

TSA = 2 ( LB + BH + LH )

⟹ 2 ( 4 × 3 + 3 × 12 + 4 × 12 )

⟹ 2 ( 12 + 36 + 48 )

⟹ 2(96)

$\therefore$ 192cm² [Ans]

$\large\fbox \red {Hope \: it \: helps \: you}$