an iron pipe is 20cm long ,exterior diameter is 25 find whole surface area
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length of pipe- 20cm
diameter of pipe- 25cm
then,
radius of pipe- 25/2cm.
then,
area= 2πr(r+ h).
= 2×22/7×25/2(25/2+20)
=11×25×65/7
=17875cm2
diameter of pipe- 25cm
then,
radius of pipe- 25/2cm.
then,
area= 2πr(r+ h).
= 2×22/7×25/2(25/2+20)
=11×25×65/7
=17875cm2
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