Question

the external and internal diameter of the cylindrical pipe are 12 cm and 10 cm respectively and the length of the pipe is 15 cm find the volume of material used to makeing the pipe also also find the total surface area of the pipe

Answer 1

external diameter=12 cm
external radius=6 cm(R)
internal diameter=10cm
internal radius=5 cm(r)
height=15 cm
volume= π(R*R-r*r)h
=22/7(6*6-5*5)*15
= 22/7*(36-25)*15
=22/7*11*15
=518.57 cubic centimetre

TSA= 2π(R-r)h+π(R*R-r*r)
=2*22/7(6-5)*15+22/7(36-25)
=44/7*1*15+22/7*11
=44/7*15+22/7*11
=128.85 square centimetre

Answer 2

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