Posted by **Ayra** on Tuesday, September 12, 2006 at 10:03am.

A pipe has an outer radius of 4 1/2 cm. If the metal is 1/4 cm thick, what is the inner diameter of the pipe?

Please help me!!!

You not you just subtract from the or the wall thickenss, then double it to get the id?

Draw two concentric circles and see if this is so.

Sorry, your wrong. The correct procedure is to subtract only.

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