Question

Fid the total surface area of the following solids. ​

Answer 1

Answer:

7(5*12)+2(5*5)+2(15*5)

= 7*60+2*25+2*75

=420+50+150

=620

then , total surface area of the following solid is 620 cm²

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Answer 2

Step-by-step explanation:

So ,

In following figure...

It can be divided into 4 cuboids of similar dimensions ..

Therefore,

TSA of 1 cuboid =2(lb+bh+lh)

=>2(12×5+5×5+12×5)

=>2(60+25+60)

=>2(120+25)

=>2(145)

=>290cm² ( Of 1 cuboid..)

Therefore all other cuboids having same dimensions have a surface area equal to this cuboid...

Therefore

Total Surface area of 4 cuboids=4×290cm²

=>1160cm²

The answer is= 1160cm²..

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