Question

4 cubes of sides 4cm are joined end to end. The surface area of the resulting solid is?

Answer 1

hey
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length = 4+4+4+4 = 16cm
breadth= 4 cm
height = 4cm

after joining the cubes , it will form cuboid

surface area of cuboid = 2(lb + bh+ lh)
= 2(16*4+4*4+16*4)
= 2(64+16+64)
= 2(144)
= 288 cm ^2

hope helped
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Answer 2

$<b><font color = "red">Heya mate. (^_-). Solution below.</font color>$
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$<font color = "blue">★ Q. -</font color>$ 4 cubes of side 4 cm are joined end to end. The surface area of the resulting solid is -?


$<font color = "pink">★ Ans. -</font color>$



♦ Given side of a cube = 4 cm

• Then,
Length of cube = 4 cm

breadth of cube = 4 cm

height of cube = 4 cm


♦ There are 4 such cubes.



♦ They are joined end to end, i.e., their length are joined. Breadth and height remain the same. Clearly they will form a cuboid.

• Then,
Length of cuboid = sum of lengths of cubes = 4 + 4 + 4 + 4 = 16 cm

Breadth of the cuboid = 4 cm

Height of cuboid = 4 cm


♦ Now,

Surface area of a cuboid = 2 (lb + bh + hl)


♦ Then, Surface area of resulting cuboid,

= 2 (lb + bh + hl)

= 2 [(16 × 4) + (4 × 4) + (4 × 16)]

= 2(64 + 16 + 64)

= 2(144)

= 288 cm².


•°• The surface area of resulting solid (cuboid) is 288 cm².
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$<font color = "orange"><marquee>Thank you..$