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## #1 2014-04-12 14:51:07

prathima
Member
Registered: 2013-09-19
Posts: 33

### mensuration

find the length of longest iron rod that can be placed in a room of 40m long, 36m broad and 22√2high

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## #2 2014-04-12 19:04:58

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 103,690

### Re: mensuration

Hi prathima;

Oh wait is it 36m not 30, I will recalculate.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

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## #3 2014-04-12 19:07:26

bob bundy
Moderator
Registered: 2010-06-20
Posts: 7,548

### Re: mensuration

hi prathima

The rod needs to go diagonally from a bottom corner to the opposite top corner.

Use the 3-D version of Pythagoras' theorem:

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #4 2014-04-12 20:11:06

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 103,690

### Re: mensuration

Hi;

Here is a shot of the longest possible rod.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

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