Hey! Sign in to get help with your study questionsNew here? Join for free to post
 You are Here: Home >< Maths

# Centre of Mass of Triangle WITHOUT coordinates?

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. Title says it all, all the stuff online is with a coordinate system.

I.e, how would I get the CoM for triangle BAD in Q7

https://c108ac80655dfd1f2bfc8c295d91...%20Edexcel.pdf
2. (Original post by 16characterlimit)
Title says it all, all the stuff online is with a coordinate system.

I.e, how would I get the CoM for triangle BAD in Q7

https://c108ac80655dfd1f2bfc8c295d91...%20Edexcel.pdf
For a triangle, distance of centre of mass from any side is 1/3 the perpendicular height from that side.

So, what's the height of BAD?
3. (Original post by ghostwalker)
For a triangle, distance of centre of mass from any side is 1/3 the perpendicular height from that side.

So, what's the height of BAD?
d*sqrt(3), thank you very much.

What about for the x coordinate.

And can I do this with scalenes?
4. (Original post by 16characterlimit)
a, thank you very much.

What about for the x coordinate.

And can I do this with scalenes?
By symmetry, the CofM will be on the line AC, extended if necessary.

Not sure why you're asking about scalenes as there are none in the question, but the same principle applies 1/3 the perpendicular height.
5. (Original post by ghostwalker)
By symmetry, the CofM will be on the line AC, extended if necessary.

Not sure why you're asking about scalenes as there are none in the question, but the same principle applies 1/3 the perpendicular height.
Just asking so I can use this method for all cases, since it obviously will work for right angled triangles.
6. (Original post by 16characterlimit)
Just asking so I can use this method for all cases, since it obviously will work for right angled triangles.
1/3 perpendicular height applies to all lamina triangles.

Write a reply…

Submit reply

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
that username has been taken, please choose another Forgotten your password?
2. this can't be left blank
this email is already registered. Forgotten your password?
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register
2. Slide to join now Processing…

Updated: May 9, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.