Question

The diagram shows a cuboid.
The height of the cuboid is 45 mm.
The end face of the cuboid is a square.
The volume of the cuboid is 162 cm.
Work out the surface area of the cuboid.
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Answer 1

Step-by-step explanation:

volume of cuboid =l×b×h=448cm

3

=l×b×7=448cm

3

=l×b=64cm

2

but base is square

∴l=b

∴l

2

=64cm

2

⇒l=b=8cm

surface area =2(lb+lh+bh)

=2(8×8+8×7+8×7)

=2(64+56+56)

=352cm

2