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Three cubes each of volume 125cm …

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Three cubes each of volume 125cm cube are joined end to end to form a cuboid find total surface area of cuboid

Posted by Sandeep Bansal 8 years, 9 months ago

CBSE > Class 09 > Mathematics

2 answers

Rashmi Bajpayee 8 years, 9 months ago

Volume of each cube = 125 cu cm

Then, side of each cube = 5cm

If these are joined, then the dimensions of cuboid

Length = 15 cm, Breadth = 5 cm, Height = 5 cm

Total surface area of cuboid = 2(lb + bh + hl)

= 2(15 × 5 + 5 × 5 + 5 × 15)

= 2(75 + 25 + 75)

= 2 × 175

= 350 sq cm

0Thank You

Karthika Gireesh 8 years, 9 months ago

Volume of cube =a³=125cm³

a=cube root of 125=5cm

So,length of cuboid=3×5=15cm

h=5cm

b=5cm

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

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

=2×50

=100cm²

1Thank You

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