Question

there are four cubes of side 7cm .if they are joined together to form cuboid find the surface area of the resulting cuboid

Answer 1

side of cube = 7cm
when they joined together to form a cuboid
length is changes = 28cm
breadth and height is same as cube = 7cm

T.S.A. of cuboid =
$2(l \times b + b \times h + h \times l)$
= 2 (28×7 + 7×7 + 7×28)
= 2 ( 196 + 49 + 196)
=490

t.s.a of cuboid is
$490 \: {cm}^{2}$

Answer 2

Answer:

Step-by-step explanation:

2(28×7+7×7+7×28)

2(196+49+196)

2×441=882 cm2