Math Is Fun Forum

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: mensuration

Hi prathima;

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

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

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

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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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: mensuration

Hi;

Here is a shot of the longest possible rod.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.