m2 help

[-=HaZ=-]

I have been given the job to work out the m2 of a room which is practically a triangle

I wondered if anyone can work out what the m2 of a triangle with sides
2.4m X 2.1m X 2.1m

 

[Old Mod]

Multiply the two sides by each other as normal (not the diagonal) and half it.

 

[Ian]

As Marc says, 2.4x2.1=5.04 divide by 2 = 2.52 m2.

 

[AliGage]

Damn Bri you beat me to it. I was waiting to see what my 7 year old said.

 

[Old Mod]

Damn Bri you beat me to it. I was waiting to see what my 7 year old said.

Hahahaha!

 

[Ian]

Lol!

 

[Dougs Third Go]

I was waiting for Pythagoras again :lol:

 

[One Day]

Oh dear :mad2:

 

[Stef]

Well I'm glad Bri wrote that down as I've never been able to work out the m2 of a triangle.

 

[Time's Ran Out]

As the sizes given are for an isosceles triangle with 2 equal sizes it has a different formula than those calculations above which refer to a right angled triangle! However in this instance as the sizes of the sides are not that far removed from each other the answer is the same - 2.52 m2.
and for those that may not know Pythagoras is just for the right angle and not area!

 

[radim]

:yikes:

 

[IHB]

I make it about 2.07m2



Think of it as 2 right angle triangles. You can get the height (approx 1.72) based on the 1.2 and 2.1. Then the area is 1.72 x 1.2 = 2.07. What's my prize?

 

[Diggy]

IHB ,Go to the top of the class , but dont take your books as you wont be there for long . As my old man usedto say.

Diggy.

 

[Martyn Leeds]

Anyone else stuck on there GCSE homework..

 

[radim]

IHB is right. just over 2 metres sq.

 

[Ian]

Looks like I need to revisit my maths text books :lol: I was adding 20% for waste on my earlier answer :smilewinkgrin:

 

[IHB]

Looks like I need to revisit my maths text books :lol: I was adding 20% for waste on my earlier answer :smilewinkgrin:

Yes I forgot to allow for all the cuts.

 

[mache]

For the type of triangle shown IBH went about it the right way due to it not being a right angled triangle. The full method would be to calculate using Herons Formula expressed as.

where

is the semiperimeter, or half of the triangle's perimeter.

However it's alot easier to go here and put the three lengths you have into the boxes and press calculate :8:

http://www.mathopenref.com/heronsformula.html

 

[steve187]

my head hurts

 

[Dougs Third Go]

For the type of triangle shown IBH went about it the right way due to it not being a right angled triangle. The full method would be to calculate using Herons Formula expressed as.

where

is the semiperimeter, or half of the triangle's perimeter.

However it's alot easier to go here and put the three lengths you have into the boxes and press calculate :8:

http://www.mathopenref.com/heronsformula.html

I like that

 

[Time's Ran Out]

I always knew my degree in mathematics would come in handy one day!:lol:
Although the triangles area can be exactly determined, the number of tiles required will no doubt depend on the individual tile size and the amount of wastage due to pattern, shape, etc.
It would normally be easier with measurements of this size just to graph out the area and overlay your tile set out to calculate a reasonable gestimate!

 

[Stef]

I always knew my degree in mathematics would come in handy one day!:lol:
Although the triangles area can be exactly determined, the number of tiles required will no doubt depend on the individual tile size and the amount of wastage due to pattern, shape, etc.
It would normally be easier with measurements of this size just to graph out the area and overlay your tile set out to calculate a reasonable gestimate!

So TJ, you couldn't really buy say 2.5m2 of tiles if the area was 2.5m2.
You would have to add 10% or more than likely add 20%+ to cover your wastage & would you charge the extra % onto the price for the customer??

 

[charlie1]

Just buy 3 m2 FFs lol

 

[Stef]

Just buy 3 m2 FFs lol

You never got the humour within the post that was intended Charlie..

 

[widler]

Id just measure it square , take away half and add 2 quarters