Question

give a answer of all questions ​

Answer 1

tsa of cuboid!=2(lb+bh+lh) 2(3.5.32.260) = 58240cm^2 lsa of cuboid =2(l+b)h = 2(3.5+32)260=18460

Answer 2

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<<<$ANSWER$>>>
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1). Given, 
Length=3.5m
Breadth= 32dm= 3.2m
Height= 2.6m
Total surface area of cuboid= 2(lb+bh+lh)
=2(3.5*3.2+3.2*2.6*3.5*2.6)
=2(28.62)
=57.24m
CSA of cuboid = 2(bh+lh)
=2(3.2*2.6+3.5*2.6)
=2(17.42)
=34.84m

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2). The formula for calculating length of the diagonal of the cuboid is 

√l^2 + b^2+ h^w

so d =√ 10^2 + 8^2 +4^2
d=√100+64+16
d=√180 cm 
d= 6√5 cm 

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(3).###

(i)1) total surface area of cube 

= 6a²= 6(4.5)²= 6×20.25= 121.5cm²

(2) lateral surface area

= 4l²= 4(4.5)²= 4(20.25)= 81cm²

(3) length of diagonal

= √3l= (1.73)(4.5)= 7.79

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(ii). Side (a)=3.2cm

Surface area of cube= 6a^2

=6 (3.2)^2

=6×(10.24)

=61.44cm^2

Lateral surface area= 4a²
= 4(3.2)²
= 4(3.2×3.2)
= 4× 10.24
=> 40.96 ✓

Diagonal of cube=> a√3

= 3.2√3