Question

4) Two cubes of side 7cm all joined togeather
Find the T.S.A of the new solid formed.

Answer 1

Step-by-step explanation:

length of side=7 cm

TSA of new solid=5(7²)+5(7²)

5×49+5×49

245+245

490cm²

Answer 2

Answer :

Given :

• Two cubes of side 7cm all joined together.

Find :

• The T.S.A of the new solid formed.

Solution :

We have from the given info that ,

• From two 7 cm cube when joined together forms a new solid.
• The solid so formed is a cuboid .

The measurements of the cuboid ,

• Length = 14 cm
• Breadth = 7 cm
• Height = 7 cm

Now what we have to find is ,

• The total surface area of the new solid formed that is the cuboid.

$\dag$Formula to be used :

${\large{\boxed{\boxed{\rm{T.S.A\: of\: Cuboid=2(lb + bh + hl )}}}}}$

Now,

• Substitute the values of cuboid in the formula .

$\dashrightarrow$ T.S.A of Cuboid = 2(lb + bh + hl)

$\dashrightarrow$ T.S.A of Cuboid = 2([14×7 ]+ [7×7]+ [14×7])

$\dashrightarrow$ T.S.A of Cuboid = 2(98 + 49 + 98)

$\dashrightarrow$ T.S.A of Cuboid = 2 × 245

$\dashrightarrow$ T.S.A of Cuboid = 490

•°• The total surface area of the newly formed cuboid is 490 cm square.

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