Question

A rectangular copper plate measures 50 cm ×40 cm. A small square of side 5 cm is cut out from each corner and the sides are folded to make an open box.



Find the external surface area and the volume of the box.

Answer 1

Answer:

External Surface Area = 2375cm²

Volume = 7875 cm³

Step-by-step explanation:

Since Each Corners are Cut By 5 m then Length and Breadth are reduced By 5 cm and Height Will Be 5 cm:-

Length =)50- 5 = 45cm

Breadth =)40 - 5 = 35cm

Height =)5 cm

First:-

Total Surface Area(T.S.A) :- 2 (lb + bh + hl)

=)2((45 x 35) + (35 x 5) + (5 x 45))

=)2(1575 + 175 + 225)

=)2 x 1975

=)3950m²

External Surface Area =)T.S.A - Area of roof

=)3950 - (45 x 35)

=)3950 - 1575

=)2375 m²

NOW,

Volume = Length x Breadth x Height

=)45 x 35 x 5

=)7875 m³

Hope it helped