Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#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

Offline

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,024

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

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

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,469

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


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

Offline

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,024

Re: mensuration

Hi;

Here is a shot of the longest possible rod.

View Image: 2014-04-13_010647.gif

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

Board footer

Powered by FluxBB