x Turn on thread page Beta
 You are Here: Home >< GCSEs

# Maths help watch

1. Help
2. Ok so your first step is to find the coordinates of C, given you know A and M. Then you can use the ratios of lengths to find the coordinates of N. Finally, work out the distance between N and B.
Hope this helps if not, I can be more specific
4. (Original post by Official-21)
Alright so first off, I was slightly wrong. You need the coords of C and B. You also don't use the ratios on the lengths as such.
First find C. You know A and M and since the M is the midpoint, AM = MC. AM = (5,-2.5) so add this to M gives C = (8,2) You can check this as it shares the y coord with D. Then to get B, you use the fact that AB = DC giving B = (11,7).
Then you use the ratios to find the location of N. So we know AM is (5,-2.5) So divide by 5 and times by 3 to give MN as (3,-1.5). Add this to M giving N as (6,3).
Now you know N and B so use pythagoras to find the length between them I got the final answer as square root of 41 since it wants the exact length.

Hope this was useful
5. how did you get AM= 5,-2.5
6. AM is M minus A so (3 - -2, 4.5 - 7) so (5, -2.5). You can also think of it as how do you get from A to M. To get from -2 to 3 you add 5. To get from 7 to 4.5 you subtract 2.5

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:
Updated: March 7, 2018
Today on TSR

### Any tips for freshers...

who are introverts?

### More snow?!

Discussions on TSR

• Latest
Poll
Useful resources

## Study tools

### Essay expert

Learn to write like a pro with our ultimate essay guide.

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

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