Question

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Answer 1

since the cube are joined it becomes a cuboid of length 15cm breadth 5cm and height 5cm

TSA of cuboid = 2(lb +bh+ hl )

=2(15*5+5*5+5*15)

=2(75+25+75)

=2(175 )

=350cm²

Answer 2

now make cubiod

length=15

breadth=5

hight= 5

area of cuboid=

formula 2(lb + bh + hl)

=. 2(15×5 + 5×5 + 15×5 )

=. 2(75+25+75)

=. 2×175

=. 350sq cm