Question

three identical cubes of side 4cm are joined end to end. find the total surface area and lateral surface area of the new resulting cuboid.

Answer 1

lenght of cuboid - 12 cm ,

breadth- 4cm ,

height- 4cm then ,

surface area of cuboid - 2 ( lxb + bxh +hxl )

so,

surface area of cuboid-- 2 ( 12x 4 +4x4 +4x12 )- 2 ( 48 + 16 +48 ) -- 2 ( 112 ) -- 224 sq  

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Answer 2

Answer:

TSA (Total Surface Area) = 896cm.sq and LSA (Lateral Surface Area) = 128cm.sq

Step-by-step explanation:

Length = 4*3 = 12cm

Breadth = 4cm

Height = 4cm

TSA (Total Surface Area)

=2h(lb+bh+lh)

=2*4 {(12*4) + (4*4) + (12*4)}

=8 (48 + 16 + 48)

=8 (112)

=896cm.sq

LSA (Lateral Surface Area)

=2h(l+b)

=2*4 (12 + 4)

=8 (16)

=128cm.sq

Therfore, TSA (Total Surface Area) = 896cm.sq and LSA (Lateral Surface Area) = 128cm.sq