# CBSE Class 9 Answered

**Please can you solve this**

Asked by sharma.vipul74 | 14 Mar, 2009, 01:48: PM

Expert Answer

Let the thickness of the open pipe be t.

Total surface area,A=4620=115.5+2π(7)(R+r)...(1)

Area of base,A=π(R+r)t=115.5...(2)

Using (1) and (2),

4620=115.5+2(7)(115.5)/t

t=0.36 cm

Answered by | 29 Mar, 2009, 06:55: PM

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